Home Health News Polio outbreak 2019: The WHO just declared another polio virus eradicated – Vox.com

Polio outbreak 2019: The WHO just declared another polio virus eradicated – Vox.com

7 min read


Polio just got one step closer to becoming the second human disease to be fully wiped out. On Thursday, World Polio Day, the World Health Organization announced that type 3 poliovirus has been eradicated worldwide.

For polio to be fully eradicated, all three wild polio strains — types 1, 2, and 3 — need to stop circulating. The three strains all cause the same horrible symptoms, including paralysis and death, but are virologically distinct.

Type 2 was eradicated back in 2015; the last case of type 3 polio surfaced in northern Nigeria in 2012 and the virus hasn’t been seen since. A poliovirus can be considered eradicated if it hasn’t been detected for three years.

“[The eradication of type 3 polio] is a significant achievement that should reinvigorate the eradication process and provides motivation for the final step — the eradication of wild poliovirus type 1,” said David Salisbury, chair of the independent Global Commission for the Certification of Poliomyelitis Eradication, in a statement Thursday.

Today, only type 1 remains at large — in Afghanistan and Pakistan. If it’s eradicated, polio will join smallpox as the only two human scourges wiped off the face of the planet. (A third disease that’s been eradicated, rinderpest, is spread mainly in cattle.) And today’s news is a step in that right direction.

But getting from the 94 cases of type 1 polio reported this year to zero won’t be easy. And, ironically, one of the biggest polio obstacles that remains was actually brought on by the immunization effort: an outdated version of the vaccine that can spread the virus.

Polio mainly affects children under the age of 5. At its peak in the middle of the 20th century, the disease killed half a million people every year. In 1988, when WHO launched the eradication program, there were more than 350,000 cases in 125 polio-endemic countries. Since then, cases of wild poliovirus have decreased by over 99 percent, according to WHO, to just 94 this year.

In the two countries where the type 1 virus is still endemic, Pakistan and Afghanistan, ongoing political conflicts continue to challenge the eradication efforts.

Health officials also struggle with cases of vaccine-derived type 2 virus. Distinct from the three “wild” virus types, these cases are caused by a mutated version of the virus that was introduced by a phased-out polio type 2 oral vaccine.

As I’ve explained with Vox’s Brian Resnick, transmission of vaccine-derived polio works like this: A person swallows the oral vaccine, which contains a live, weakened virus. That virus can live in the gut for a while and then pass from person to person, developing mutations along the way. “When it circulates for a long time among too many poorly vaccinated or unvaccinated children, this is how it is allowed to mutate and become virulent again,” Michel Zaffran, director of the polio eradication program at the World Health Organization, told us.

In 2016, the Polio Global Eradication Initiative phased out this vaccine, switching to a safer oral vaccine. The outbreaks that are happening now were sparked before the switch.

So despite all the success beating back polio, some major challenges remain. But, as Richard Conniff writes in Scientific American, the polio program has a history of beating the odds:

India, where polio was paralyzing 500 to 1,000 children per day in the 1990s, eliminated the disease in 2014. The wrenching spectacle of child polio victims begging in that nation’s streets, with their twiglike legs folded beneath them, is now history.

Nigeria, where antigovernment gunmen assassinated nine women polio vaccinators in 2013, has now gone three years without any evidence of wild poliovirus—and seven years without type 3—largely through the heroic persistence of community health workers.

The current goal for full polio eradication is 2023. “The achievement of polio eradication will be a milestone for global health,” said Tedros Adhanom Ghebreyesus, director-general of the World Health Organization and chair of the Global Polio Eradication Initiative, in a statement Thursday. “We remain fully committed to ensuring that all necessary resources are made available to eradicate all poliovirus strains.”

Let’s block ads! (Why?)

Source link


  1. Morton Honsinger

    May 11, 2021 at 8:06 am

    Have you ever heard of second life (sl for short). It is basically a game where you can do anything you want. SL is literally my second life (pun intended lol). If you would like to see more you can see these second life articles and blogs


  2. affiliate program

    May 20, 2021 at 11:30 pm

    Yay google is my queen assisted me to find this great site!


  3. slot game online

    May 21, 2021 at 6:55 am

    I believe this site contains some rattling superb information for everyone :D.


  4. freeweblink.org

    May 26, 2021 at 3:29 am

    Good info once again! I am looking forward for your next post:)


  5. Lehn Law

    May 26, 2021 at 11:03 pm

    I’m very happy to read this. This is the type of manual that needs to be given and not the accidental misinformation that is at the other blogs. Appreciate your sharing this best doc.


  6. arlingtonwebdesigndirectory.com

    May 27, 2021 at 11:30 pm

    I like this weblog very much, Its a real nice spot to read and receive info.


  7. judi online

    June 4, 2021 at 2:41 am

    Some really nice and utilitarian information on this web site, also I conceive the pattern has excellent features.


  8. Dominic Partenope

    June 4, 2021 at 5:49 pm

    This was awesome! I would like you to clean up all this spam though


  9. situs judi online

    June 8, 2021 at 12:13 am

    I’ve been exploring for a little for any high-quality articles or blog posts in this kind of area . Exploring in Yahoo I ultimately stumbled upon this website. Studying this information So i am happy to exhibit that I have an incredibly good uncanny feeling I found out exactly what I needed. I so much surely will make certain to don’t forget this website and provides it a look regularly.


  10. Randolph Fennimore

    June 15, 2021 at 10:42 am

    Have you ever heard of second life (sl for short). It is basically a video game where you can do anything you want. sl is literally my second life (pun intended lol). If you want to see more you can see these second life websites and blogs


  11. situs judi online

    June 25, 2021 at 6:25 am

    Thank you for sharing with us, I believe this website really stands out :D.


  12. Benjamin Law Firm LLC

    June 28, 2021 at 1:08 am

    I liked as much as you will obtain carried out right here. The comic strip is tasteful, your authored subject matter stylish. nevertheless, you command get bought an shakiness over that you wish be delivering the following. unwell undoubtedly come further formerly once more as exactly the same nearly a lot steadily within case you defend this hike.


  13. wealthmason.com

    June 29, 2021 at 11:14 pm

    I was reading some of your blog posts on this internet site and I believe this internet site is really informative! Keep posting.


  14. yumpu.com

    July 1, 2021 at 12:14 am

    Very interesting info!Perfect just what I was searching for!


  15. teleadreson.com

    July 1, 2021 at 1:59 pm

    thank you for all your efforts that you have put in this. Very interesting information.


  16. You actually make it appear really easy with your presentation but I to find this topic to be actually something that I feel I’d never understand. It seems too complex and very wide for me. I’m taking a look ahead to your next submit, I will try to get the hang of it!


  17. Brand Brand Nomberg & Rosenbaum LLP

    July 28, 2021 at 5:43 pm

    I am not real good with English but I get hold this very easy to translate.


  18. biznet-us.com

    July 31, 2021 at 3:29 pm

    Awsome site! I am loving it!! Will come back again. I am taking your feeds also


  19. adult social media

    August 3, 2021 at 3:44 pm

    I was just searching for this info for some time. After six hours of continuous Googleing, at last I got it in your website. I wonder what’s the lack of Google strategy that don’t rank this type of informative web sites in top of the list. Usually the top websites are full of garbage.


  20. Horacio Billingslea

    August 16, 2021 at 7:17 pm

    I am impressed with this site, really I am a big fan.


  21. empowher.com

    August 17, 2021 at 9:50 pm

    I went over this site and I believe you have a lot of wonderful info, saved to favorites (:.


  22. Personal Injury Attorney - Rego Law Firm

    August 20, 2021 at 10:48 pm

    Loving the information on this web site, you have done outstanding job on the content.


  23. underwater hull cleaning

    September 2, 2021 at 4:40 am

    Good web site! I really love how it is easy on my eyes and the data are well written. I am wondering how I could be notified whenever a new post has been made. I have subscribed to your feed which must do the trick! Have a nice day!


  24. panduan slot online

    December 9, 2021 at 3:16 am

    Right away I am ready to do my breakfast, when having my breakfast coming yet again to read more news.

    Slot Online


  25. slot online

    December 11, 2021 at 2:24 pm

    Hi! This is my 1st comment here so I just wanted to give a quick shout
    out and say I truly enjoy reading your articles. Can you recommend any other blogs/websites/forums that go over the same topics?
    Thanks a ton!
    Here is my page if you want to see it out!: Slot Online


Leave a Reply

Your email address will not be published. Required fields are marked *

Check Also

Did Nets’ Kevin Durant Undergo Crazy Body Transformation? (Photos) – Game 7 – Game7

[ad_1] Brooklyn Nets star Kevin Durant is already arguably the best player in the NBA. Alt…