Showing posts with label Zika virus. Show all posts
Showing posts with label Zika virus. Show all posts

Saturday, August 13, 2016

Friday: The Immoral Minority

While philosopher Slavoj Žižek isn’t everybody’s cup of quirky tea, he’s got a valid point in this video.

The right-wing has abandoned its claim to be the Moral Majority.

Don’t mistake this as a validation of the Democratic Party here in the U.S.; they are only earning a majority in terms of politics, and in no small part by being the “Not GOP” party. With its leadership cozying up to war criminals, climate denialists and fossil fuel-based polluters, and general denigrators both of human rights and the public commons, they are not the Moral Majority by default.

But an unorganized left in this country rejects the right-wing’s ethical decay implicitly underpinning the Republican Party. The left rejects those values which undermine democracy — misogyny, racism and marginalization of other minorities, the ongoing subversion of individuals’ rights to promote the interests of corporations.

A true Moral Majority won’t support a social contract undermining democracy by limiting life, liberty, and happiness’ pursuit to a narrow few. It’s well past time for the broader left to coalesce into an organized entity based upon the belief that all humans are created equal and deserving a more perfect union.

Zapped by Zika

  • “ZIKA VIRUS | Days since White House funding request: 186 | Funding response from Congress: $0 | Zika cases in US and territories: 8,580” (Tweet, Dan Diamond/Politico)
  • Peter robbed to pay Paul: DHHS pulls money from other projects to fund Zika vaccine research (Reuters) — Lacking new dedicated funding from Congress, U.S. Department of Health and Human Services squeezed out $81 million and spread it into Zika vaccine research, with $34 million of that to the National Institutes of Health and $47 million to the Biomedical Advanced Research and Development Authority (BARDA). The white House had asked for $1.9 billion last fall for Zika, but that amount was pared down by 42%; Republicans then objected to any of the remaining portion going to Planned Parenthood, putting Democrats in a bind. Access to birth control is critically important to preventing Zika’s spread; access to abortion could prevent the birth of severely deformed infants who will live short, utterly miserable, and expensive lives.
  • Arthrogryposis — congenital joint defects — associated with Zika during pregnancy (The BMJ) — Dislocated and or misshaped knees, ankles, elbows, hips appeared in children born with other neurological defects found in Zika-infected fetuses. Further research is necessary to prove both the virus is causal and learn the mechanism by which the virus inflicts this damage in utero. The patients had been tested for other known causes of arthrogryposis — toxoplasmosis, cytomegalovirus, rubella, syphilis, and HIV. All were negative.
  • First infant death due to Zika reported in Texas (KHOU) — The infant’s mother traveled to El Salvador during pregnancy where it is believed she contracted the virus.
  • Zika virus case confirmed in Monroe County, Michigan (Detroit Free Press) — But the method of infection is not clear (what?!). County health and state officials are working toward mosquito surveillance.

Wheels and steals

  • Millions of vehicles made from 1995 on vulnerable to keyless-remote hacking (USENIX) — Researchers at University of Birmingham and Kasper & Oswald GmbH presented a paper at the USENIX 2016 conference, showing more than 20 years’ worth of VW Group vehicles are hackable using inexpensive Arduino-based RF transceiver technology. Alfa Romeo, Chevrolet, Peugeot, Lancia, Opel, Renault, Ford and other makes relying on the Hitag2 access security method are similarly at risk. Researchers also looked at after-market keyless entry remotes for these and other vehicles; the cars for which these worked were also vulnerable. All vehicles tested appear to be those made for the European market, but the research noted the radio frequency differences — 315 MHz band in North America and the 433 MHz or 868 MHz band in Europe — used in remotes. The paper’s research team notified VW in November 2015 of their results; NXP Semiconductor, a manufacturer of Hitag2 remote technology, was also notified. NXP had already informed customers of the vulnerability in 2012 and has already improved device security.
  • Volkswagen suppressed news about keyless remote insecurity since 2013 (Bloomberg) — The same researchers from University of Birmingham and Kasper & Oswald GmbH had originally approached NXP Semiconductor and VW with their work in 2012 and 2013, respectively. VW sued and blocked release of their work; the paper was released this past week at USENIX only “after lengthy negotiations” and the removal of a single sentence which car thieves could use to easily crack the keyless remotes. A number of suspicious automobile thefts over the years may have relied on hacking remotes; will insurance companies look into these thefts and demand recovery from VW?
  • DOE grants Ford $6M for fuel cell research (Detroit Free Press) — Existing fuel cell technology has been too expensive for successful commercialization; the grant will be used to develop cheaper technology competitive with battery and internal combustion engines.

Longread: Geopolitics
FiveBooks.com interviewed former state department official and senior fellow at the Council on Foreign Relations, Jennifer M. Harris, about geopolitics. She discusses the topic and offers five book recommendations about the same. Harris is the co-author of recently released War by Other Means: Geoeconomics and Statecraft. Given her work as U.S. National Intelligence Council staff followed by work on economics under then-Secretary of State Hillary Clinton, this interview might offer a preview to future statecraft.

Friday Jazz
It’s still Friday somewhere according to my clock. Try French performer Zaz, stage name for Isabelle Geffroy. If you like this ditty, preview more of her work on her channel on SoundCloud.

It’s been a hectic week here; next week doesn’t look any better, but I’ll aim to be here on Monday. Have a relaxing weekend!

Monday, July 25, 2016

Bringing out the Dead: What We Know about Zika Virus Effect on Human Tissue

[(A) Control neurosphere (B) Zika-infected neurosphere Source: Science, 13MAY2016 http://ift.tt/2a4298S]

[(A) Control neurosphere
(B) Zika-infected neurosphere
Source: Science, 13MAY2016
http://ift.tt/2a4298S]

Because unproven claims persist that chemical exposure — specifically the pyridine-based pesticide pyriproxyfen — causes the birth defects seen in children born to women exposed to Zika virus, I am bringing out the dead, laying out the bodies.

By ‘bodies’ I mean sharing here pictures of cells you see in the embedded photos from a peer-reviewed study published this May.

In these images you’ll see the damage done to human tissue in lab conditions.

No pyriproxyfen was present.

How Researchers Studied Zika
This is the methodology researchers used:

1) The researchers used human stem cells to create neurospheres — the kind of cells which turns into nerve and brain tissue in an actual embryo.

2) They set aside control samples of neurospheres which were not infected.

3) They infected test samples neurospheres with Brazilian Zika virus.

4) They observed the changes in the infected neurospheres.

5) They compared them to the uninfected control samples.

6) They wrote and published a report on their findings.

The image above is the best example from their report of the difference between Zika-infected cells and the uninfected test samples.

What Researchers Found in this Study
In short, Zika inhibits, damages, and kills infected neurospheres.

This is what we can expect to happen to a fetus’ brain or nerve tissues when infected by Zika under the right conditions during early pregnancy.

[(A) Control mock-infected organoid (B) Zika-infected organoid (damage noted at arrows; growth was also inhibited)]

[(A) Control mock-infected organoid
(B) Zika-infected organoid (damage noted at arrows)]

What Else Researchers Found in this Study
The researchers also conducted a very similar test on human brain organoids. These are not single neurospheres but neuro-tissue grown from stem cells so that they form a model like a tiny brain. Not a brain, a tissue-based model of a brain.

They used the same six steps above using a mock-infected model, a Zika-infected model, and a dengue virus-infected model. (Dengue fever is caused by a flavivirus — the same family of viruses to which Zika and yellow fever belong.) Researchers found Zika virus caused similar destructive damage on these larger models while limiting their growth; they did not find the same damage or destruction in the dengue-infected models and none in the mock-infected control models. Zika alone damaged neurological tissue models.

Researchers also studied neural stem cells (NSCs) — the simplest neuro tissue model — and found similar results in which the Zika virus killed off NSCs. Studying NSCs, neurospheres, and organoids, the researchers observed Zika’s actions on different stages of neuro tissue maturity. In each of these models, from the simplest (NSCs) to the most complex (organoids), Zika was destructive.

[ZIKV (Zika virus) induces death in human neurospheres. These micrographs show the ultrastructure of mock- and ZIKV-infected neurospheres after 6 days in vitro. (A) Mock-infected neurosphere showing cell processes and organelles. (B) ZIKV-infected neurosphere showing a pyknotic nucleus, swollen mitochondria, smooth membrane structures, and viral envelopes (arrow). (C) Viral envelopes on the cell surface (arrows). (D) Swollen mitochondria. (E) Viral envelopes inside the endoplasmic reticulum (arrows). (F) Viral envelopes close to smooth membrane structures (arrows).]

[ZIKV (Zika virus) induces death in human neurospheres. These micrographs show the ultrastructure of mock- and ZIKV-infected neurospheres after 6 days in vitro.
(A) Mock-infected neurosphere showing cell processes and organelles.
(B) ZIKV-infected neurosphere showing a pyknotic nucleus, swollen mitochondria, smooth membrane structures, and viral envelopes (arrow).
(C) Viral envelopes on the cell surface (arrows).
(D) Swollen mitochondria.
(E) Viral envelopes inside the endoplasmic reticulum (arrows).
(F) Viral envelopes close to smooth membrane structures (arrows).]

Other Research on Zika Using Mouse Tissue
Three other studies published in May this year using mice or mouse tissues likewise showed evidences of neurological tissue and brain damage or growth suppression when infected by Zika virus. The studies came from research facilities in Brazil, China, and the U.S. — and in each study, pyriproxyfen was not included. The Zika-infected specimens showed damage and the control specimens did not.

The study from Brazil at the University of São Paulo also included research using human stem cells, comparing a Brazilian strain of Zika against an African strain:

Beltrão-Braga, Muotri, and their colleagues also grew brain organoids from human stem cells and infected these in vitro models with the Brazilian and African strains of the virus. In the human mini brains, both strains of the virus caused cell death, but the Brazilian strain appeared to also interfere with the formation of cortical layers. The virus didn’t replicate in the brain organoids grown from chimpanzee stem cells, suggesting it may have adapted to human tissue, the researchers noted in their paper.

Emphasis mine. Research published earlier showed Zika has already mutated rapidly after arriving in Brazil, with at least nine variants found inside the last two years.

What’s Next in Zika Research
What researchers don’t yet know, for starters: How Zika works — how does it damage or kill cells? When exactly does the virus do the most damage? What mechanisms interfere with Zika’s operations and can they be used in vaccines or drug therapy? What makes Zika different from dengue or other flavivirus? What does Zika do to adult neuro tissue to cause Guillain-Barre Syndrome? Which adults are most at risk? Will the different mutations in Brazil respond differently to vaccines? How long can humans carry live Zika virus? Has the virus mutated and become transmissible by bodily fluids or aerosol? These are just a few of the questions we still have about Zika.

There are some good guesses about Zika’s mechanisms — like this hypothesis focusing on vitamin A storage in the liver, which also suggests Zika may negatively affect liver cells (yet another avenue of research needed). But will a vaccine targeting this activity work for other flavivirus, too? What if this guess is wrong; are there other approaches we’ve yet to hear about?

We won’t have any of these answers in a reasonable period of time if we don’t have adequate funding.

It’s not just birth defects we are talking about here, either. Look at the damage in those images again; this virus not only damages fetal nerve and brain tissue, it kills fetuses. Infants born with Zika-related defects may be blind and may lead short, painful lives. And it may kill and maim adults, too, if they develop a serious case of Zika-related Guillain-Barre Syndrome.

Let’s not bring out any more Zika dead.

(Note: Forgive me for the simplistic terms used in this post if you have a background in science. I had to make this as brief and succinct as possible for those who don’t have that background.)
___________

Source:
Zika virus impairs growth in human neurospheres and brain organoids
BY PATRICIA P. GARCEZ, ERICK CORREIA LOIOLA, RODRIGO MADEIRO DA COSTA, LUIZA M. HIGA, PABLO TRINDADE, RODRIGO DELVECCHIO, JULIANA MINARDI NASCIMENTO, RODRIGO BRINDEIRO, AMILCAR TANURI, STEVENS K. REHEN
SCIENCE13 MAY 2016 : 816-818
Zika virus infection in cell culture models damages human neural stem cells to limit growth and cause cell death.
URL: http://ift.tt/2a4298S

Zika Studies Using Mice:
F. Cugola et al., “The Brazilian Zika virus strain causes birth defects in experimental models,” Nature, doi:10.1038/nature18296, 2016.

C. Li et al., “Zika virus disrupts neural progenitor development and leads to microcephaly in mice,” Cell Stem Cell, doi:10.1016/j.stem.2016.04.017, 2016.

J. Miner et al., “Zika virus infection during pregnancy in mice causes placental damage and fetal demise,” Cell, doi:10.1016/j.cell.2016.05.008, 2016.

Friday, July 22, 2016

Friday: The End of the World


I wake up in the morning and I wonder
Why ev’rything is the same as it was
I can’t understand, no, I can’t understand
How life goes on the way it does


— excerpt, The End of the World, written by Arthur Kent and Sylvia Dee

Jazz version of this song first released by Skeeter Davis in 1962 performed here by Postmodern Jukebox’s Scott Bradlee and band with Niia’s vocals.

A few people in my timeline have asked over the last several months, “Is this the end of the world, or does it just feel like like it?”

It’s the end of something, that’s for sure.

Z is for Zika

I can’t make this clear enough to Congress: you’re playing with lives here, and it’s going to be ugly. It will affect your families if anyone is of childbearing age. I haven’t seen anything in the material I’ve read to date that says definitively studies are underway to verify transmission from Brazil’s Culex quinquefasciatus to humans. There’s a study on the most common U.S.’ Culex pipiens species which showed weak transmission capabilities, but once it’s proven quinquefasciatus can transmit, it’s just a matter of time before more effective pipiens pick up and transmit the virus, and they may already have done so based on the two cases in Florida. GET OFF YOUR BUTTS AND FUND ADEQUATE RESEARCH PRONTO — or risk paying for it in increased health care and other post-birth aid for decades.

Still Brexin’ it

Clean-up duty

  • Looking for MH370 in all the wrong places — for two years (IBTimes) — Bad suppositions? Or misled? Who knows, but the debris found so far now suggests the plane may have glided across the ocean in its final moments rather than plummeting nose first.
  • Enbridge settles $177 million for 2010 oil pipeline rupture (ICTMN) — Seems light for the largest ever oil spill inside the continental U.S., and their subsequent half-assed attempts to clean up the mess. Check the photo in the story and imagine that happening under the Straits of Mackinac between Lakes Huron and Michigan. How did it take them so long not to know what had happened and where?
  • Broadband companies now have a real competitive threat in Google Fiber (USAToday) — It’s beginning to make a dent in some large markets where Google Fiber’s 1Gb service has already been installed. But it is slow going, don’t expect it in your neighborhood soon. You’re stuck with your existing slowpoke carriers for a while longer.
  • Cable lobby counters FCC pressure on set-top boxes (Ars Technica) — Sure, they’ll yield to the FCC on set-top boxes, but they won’t offer DVR service and each cable provider with 1 million subscribers or more will be responsible for their own apps. Cable lobby claims copyright issues are a concern with the DVR service; is that a faint whiff of MPAA I smell?

Beach-bound longread
Check out this piece in WIRED: David Chang’s Unified Theory of Deliciousness. I’m hungry after reading just a portion of it.

Hasta luego, mi amigas. Catch you Monday if the creek don’t rise.

Tuesday, July 19, 2016

Tuesday: Crazy


Come on now, who do you, who do you, who do you, who do you think you are,
Ha ha ha bless your soul
You really think you’re in control

Well, I think you’re crazy
I think you’re crazy
I think you’re crazy
Just like me


— excerpt, Crazy by Gnarls Barkley

Why’d I pick this song today? Oh, no reason. Just kind of popped into my head while I was reading through my aggregators.

Ahem. Anyhow…not much time again today, lot of hurry-up-and-wait stuff demanding my time.

Turkey curry buffet

Quick lap around the track

  • BREXIT: IMF cuts UK’s growth forecast (The Guardian) — Really, what the hell did the Leavers expect? Put the brain trust and creative sector into a tailspin as so many are immigrants, and ask them to sustain or expand growth? Completely unrealistic.
  • US-UK RELATIONS: Presser today with Johnson and Kerry (The Guardian) — You watch it. I can’t even with that lying hack Johnson — he spun more crap right to journos’s faces. And nobody takes these two to task over most recent bombings in Syria or Yemen.
  • ZIKA: CDC studying unusual case of UT caretaker infected by Zika (CDC.gov) — The elderly Utah man who died of Zika recently somehow infected his caretaker with the virus without sexual contact. Mosquitoes may have been involved, but UT isn’t home to known carriers Aedes aegypti and albopictus species. The deceased, however, had a viral load 100,000 times greater than the average Zika patient. What?!
  • EARTHQUAKES: Earthquake swarm continues in San Benito County, California (NBC Bay Area) — 24 quakes in 24 hours based on report published about two hours ago. The affected area is west of Silicon Valley and the San Andreas fault line.
  • POLICE REFORMS: Hire more women: one of several known solutions to police racism and abuse (Yes! Magazine) — Take note of the gender of police accused and charged with abuse and killing of unarmed civilians. Body cameras, greater diversity matching community, and openness to research also included in solutions.

That’s all I have time for now. See you tomorrow!

Monday, June 27, 2016

Monday: Fierce Dog

Hunger and fear are the only realities in dog life: an empty stomach makes a fierce dog.

— excerpt, personal journal of Capt. Robert Falcon Scott

This short film by Aaron Dunleavy was inspired by his childhood in Blackburn, Lancashire UK. The script was improvised and cast using locals.

All districts in Lancashire voted Leave during last week’s Brexit referendum, with 65% of Blackburn voters supporting Leave.

Worth noting an article in Lancashire Telegraph about an Aldi’s store under construction. Aldi’s is a German-owned grocery store chain; have to wonder if construction will be completed.

Brexit botch bits

  • @shockproofbeats on Brexit’s impact on Northern Ireland (Storify) — It’s messy now and promises to be even uglier.
  • Downside for China (and other foreign investors): Real estate purchases may be put on hold (SCMP) — Some deals in the works may be halted until the pound is more stable. On the other hand, Britain may step in and put the brakes on sales; too easy for overseas entities with big money to buy up property while pound is depressed.
  • Upside for China (and other banking centers): Business could pick up in Hong Kong (SCMP) — London is the second largest trading center of yuan next to Hong Kong; some of the business could shift back to Hong Kong, especially if HSBC bank choose to relocate its headquarters to HK from London.
  • No change in position on Brexit referendum since last Friday according to PM David Cameron (Independent-UK) — Though Cameron is now going to leave in September. He continued to push triggering of the Article 50 to his successor while taking pot shots at Labor Party over its purge this weekend. Not certain most Americans will notice just how Cameron has managed to shift the blame to both MPs and the people for a referendum he proposed, or how he has turned execution of Article 50 into a poisoned chalice. Lord Chancellor Secretary of State for Justice Michael Gove, Leave campaign proponent, was present at today’s session in Parliament but said nothing before disappearing. Boris Johnson, MP for Uxbridge and South Ruislip and Leave campaign proponent, was noticably absent. Wankers all three.

SCOTUS Week
Waiting around watching the court for good or ill until this morning is kind of like waiting for Shark Week — hey, it IS Shark Week! What a coincidence!

Miscellaneous trouble

Promises to be a busy week ahead. Stay tuned!

Thursday, June 23, 2016

Thursday: Rough Beast

Mere anarchy is loosed upon the world,
The blood-dimmed tide is loosed, and everywhere
The ceremony of innocence is drowned;
The best lack all conviction, while the worst
Are full of passionate intensity.

— excerpt, The Second Coming by William Butler Yeats, c. 1919

This lovely bit of atmospheric electronica by åpne sinn from the 2012 album entitled en seier is an odd fit for the anarchic theme. en seier is Norwegian for ‘one victory’, which is how åpne sinn‘s Steve Brand characterizes each day of life after surviving a heart attack, a personal apocalypse like Yeats’ rough beast of The Second Coming.

The last couple of weeks culminating in today’s Brexit referendum feel like the onset of a global heart attack. Hope we enjoy a victory after this strife, but it’s too soon for more than hope.

Still a little off, not up to any more reading today after staying up far too late watching the House Democrats’ sit-in protest last night. Here’s a few things worth looking at:

  • DIESELGATE: Fuzzy definition of ‘cold’ may have led to EU passenger diesel cars’ spewing more NOX than expected (Ars Technica) — This means ALL EU makers of passenger diesels, not just Volkswagen Group, are producing too much NOX at low temperatures within an unclear range of ‘cold’. We’ve already seen a lawsuit in the U.S. against Mercedes for this reason.
  • ARTIFICIAL INTELLIGENCE: ‘Concrete Risks in AI Safety’ (paper, PDF at arXiv.org) — Researchers from Google Brain, OpenAI, Stanford University and UCBerkeley looked at the potential risks of using AI. specifically

    …the problem of accidents in machine learning systems. We define accidents as unintended and harmful behavior that may emerge from machine learning systems when we specify the wrong objective function, are not careful about the learning process, or commit other machine learning-related implementation errors.

    Worthwhile read, but I see a problem already, though, a blindspot they come so close to resolving but fail to recognize. The research team is not particularly diverse, nor is the AI development community. They will program systems based on a world as they understand it, not as it is even though they believe they are programming for a rich and noisy environment. The results will be far worse than blue screens of death.

  • ELECTRIC VEHICLES: Siemens suggests trucks powered by catenary electric lines (QZ) — Interesting concept, using electricity a la late 1800s trolley cars versus expensive and weighty batteries. But the infrastructure required…I don’t know. But that’s a lot more potential profit for Siemens, eh?
  • ZIKA VIRUS: Lame Congress funding bill on Zika defense is lame (Jezebel) — Really can’t improve on Jezebel’s hed: ‘
    Amid Gun Control Protests, House Passes a Shitty, Ineffective Zika Virus Bill‘. Yeah, that, especially the part where religious fanatics put their personal faith ahead of suffering by ensuring no funds are used by Planned Parenthood for birth control to prevent conception by persons infected with Zika. Hey You Radical Fundamentalist Anti-Science Freaks In Congress: Get Ready To Pay For Many Microcephalic Babies’ Lifetimes And Guillain-Barré Syndrome Care. Pro-life my left arse cheek. More like pro-torture for women and babies.

That’s enough for today, I need to reserve my strength for the outcome of the Brexit referendum. Toodles.

Tuesday, May 31, 2016

Tuesday Morning: Family

Don’t read anything into this music video. It’s the only one I could think with family as the theme.

Which is why I have to bail on you folks today: family. My folks are in town and are now subsuming the entire day here. I’ll try to have a normal post tomorrow, but no guarantees since the folks are here through Thursday. And you surely know how it works when family arrives from out of state — anything can happen.

Speaking of family, this post is worth some discussion:

The richest families in Florence in 1427 are still the richest families in Florence (QZ) — Wow. I wonder how this fits into Piketty’s work on inequality?

You can see this at work elsewhere across Europe; they protected the wealthy with peerage and pulled them into royalty.

Like the marriage this past week of Lady Charlotte Wellesley, the Duke of Wellington’s daughter, to Alejandro Santo Domingo, a Colombian investment banker.

Not just any banker; a billionaire already highly connected and swimming up to his ears in more billions from your beer consumption.

Two hundred years ago this would have been unthinkable, a scandal; peers did not wed the trade class. Apparently wars and the expensive amusements of the idle rich have a way of upending class barriers when capital accrues on the other side of the tracks.

Side note: Fear of Zika kept attendees away from the couple’s engagement party this February. If big money is afraid of Zika, why aren’t we seeing more investment in addressing prevention, infection control, vaccine, and therapy?

I guess not every family matters. Open thread as usual, play nicely!

Thursday, April 14, 2016

CDC: Zika Virus Confirmed as a Cause of Microcephaly

CDC director Dr. Tom Frieden confirmed Wednesday that the flavivirus known as Zika is a cause of microcephaly and other severe fetal brain defects.

The confirmation is based on an evaluation of available data for potential teratogenic effects. Using both Shepard criteria and Bradford Hill criteria, researchers proved prenatal Zika virus infection has a causal relationship with microcephaly and other serious brain anomalies.

The first set of seven criteria used in the assessment were developed by Dr. Thomas Shepard to assess an agent’s teratogenicity — the ability to cause birth defects. The criteria of proof are:

1. Proven exposure to agent at critical time(s) in prenatal development

2. Consistent findings by two or more epidemiologic studies of high quality

a. control of confounding factors
b. sufficient numbers
c. exclusion of positive and negative bias factors
d. prospective studies, if possible, and
e. relative risk of six or more

3. Careful delineation of the clinical cases. A specific defect or syndrome, if present, is very helpful.

4. Rare environmental exposure associated with rare defect. Probably three or more cases.

5. Teratogenicity in experimental animals important but not essential.

6. The association should make biological sense.

7. Proof in an experimental system that the agent acts in an unaltered state. Important for prevention.

______
Note:
Items 1~3 or 1, 3, and 4 are essential criteria.
Items 5~7 are helpful but not essential.

Shepard criteria summary:

1. The microcephaly and other brain defects observed in infants and fetuses were consistent with maternal Zika infection during first and second trimester of pregnancy. Mothers exhibited symptoms, and/or had infections confirmed by labs, and/or had traveled to areas where Zika was endemic. This criterion was met.

2. Data documenting the location of Zika virus infections and the subsequent incidence of microcephaly in those areas was supported by two epidemiologic studies. But as sample sizes were too small and controls were lacking, this criterion has not yet been met.

3. Cases manifesting with a very specific defect (an atypical microcephaly) or syndrome (a narrow range of neurological defects in tandem with microcephaly) satisfied this third criterion. With Zika infection, microcephalic cases displayed adequate bone tissue and scalp skin production, but ‘collapsed’ due to the disrupted development of fetal brain tissue. This is not common in other microcephalies.

4. An adequate number of cases fulfilled the criteria of rare exposure and rare defect — one example cited was that of a pregnant woman who traveled for a week to areas with Zika were Zika was not endemic. She tested positive for Zika during her second trimester, and the fetus displayed brain defects associated with Zika after the infection.

5. Studies for this criteria — teratogenicity in animal models — are still under way. This criterion is not yet satisfied.

6. This criterion is met as the causal relationship makes biologic sense.

7. This criterion does not apply to infectious agents.

The essential Shepard criteria have been met for proof of teratogenicity.

Bradford Hill criteria summary

Of the nine criterion — the strength of association, consistency, specificity, temporality, biologic gradient, plausibility, coherence, experiment (on animal models), and analogy — only two criterion are not applicable or not available. The remaining seven criterion were met in much the same manner as the Shepard criteria 1, 3, 4 were met.

What’s next

A spectrum of additional fetal abnormalities has not yet been fully identified in association with Zika infection. This will become clear once some pregnancies being monitored reach term.

We don’t yet know if Zika virus affects adult neurological tissues; some cases of Guillain-Barre Syndrome (GBS) have been reported in areas where Zika is endemic. GBS has occurred in patients after viral infections where neurological tissues have been affected; it would make biologic sense for there to be a causal relationship between Zika and GBS. However, GBS has occurred in patients long after an initial infection, making it difficult to see obvious relationships without further screening and testing.

A Zika vaccine may be some time off; only yellow fever and a couple of encephalitis viruses have vaccines while others like West Nile and dengue do not.

Mosquito control varies widely from state to state, let alone by county or municipality. We do not know if it is adequate to ensure Zika’s spread via Aedes aegypti and Aedes albopictus mosquito species is limited. U.S. experience with the spread of West Nile Virus may be informative.

Funding for additional research, education, training, vaccine development and mosquito control, as well as funding increases for birth control are much needed, But the GOP-led Congress will likely avoid this issue during the remaining days it is in session this election year.

In the meantime, if you’re around mosquitoes in warmer areas of the U.S., are pregnant, plan to be pregnant, or might get someone pregnant, check the CDC’s guidelines on Zika.