Yet the best vaccines also serve another, critical, function: They block a pathogen’s transmission from one person to another. And this result, often called an “indirect” effect of vaccination, is no less important than the direct effect of preventing the disease caused by that pathogen. In fact, during a pandemic, it probably is even more important.
That’s what we should be focusing on right now. And yet we are not.
Stopping a virus’s transmission reduces the entire population’s overall exposure to the virus. It protects people who may be too frail to respond to a vaccine, who do not have access to the vaccine, who refuse to be immunized and whose immune response might wane over time.
The benefits of this approach have been demonstrated with other pathogens and other diseases.
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