There have been no new cases of naturally occurring polio in North America in recent years. Yet there are approximate...

Abigail-Okereke on February 15, 2022

Explanining B

Hello, I was between answer choice A and B but ended up choosing B. Can you explain why B is wrong?

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Abigail-Okereke on February 16, 2022

Never mind I figured it out! The fact that the kids who are immune compromised are getting sick with the OPV strengthens (not weakens) the conclusion that they should switch to IPV.

Emil-Kunkin on March 18, 2022

Hi Abigail,

I think you're exactly right- although we may not be able to go as far as to say that B strengthens. While the kids being immunocompromised might make it worse if they get polio- we don't know anything about the nature of their immune disorders. It may strengthen, or it might be immaterial

Either way, A clearly weakens the argument. Since switching would lead to new natural cases of polio, these new natural cases might completely offset, or even lead to a net increase in polio cases per year.