01:56:34
Read this excerpt from "Herd about the Flu."
What is the main idea presented in this excerpt?
The flu shot helps prevent huge numbers of infections. Even
when it doesn't fully prevent infection in every person, the
shot makes any flu infection less serious. On a global scale,
the vaccine can reduce the number of infections only if most
people in the community take it. That's because vaccines
need to reach enough people to achieve a "herd immunity,"
the level of immunity needed to prevent the virus from
spreading. If too few people get the vaccine, the people who
receive it may not be well protected against infection.
So the next time you are at the drugstore, and you see No
Flu Shots Available, think about the reasons behind it. Drug
makers are scared to make too many flu shots because
they could lose too much money. They then make fewer flu
shots and the effect of the flu shots becomes weaker
because not enough people take it. People become more
reluctant to take the flu shot since they don't think it will fully
As fewer people get the flu virus, the flu shot becomes
less and less useful.
O As fewer people get the flu virus, the flu shot becomes
more and more useful.
O As fewer people get the flu shot, it becomes more
effective, but as more people get it, the flu shot becomes
less effective.
O As fewer people get the flu shot, it becomes less
effective, but as more people get it, the flu shot becomes
more effective.
.
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