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Can vaccinated people spread delta?
In this week's edition of the Covid Q&A, we look at how contagious the delta variant is for vaccinated people. In hopes of making this very confusing time just a little less so, each week Bloomberg Prognosis is picking one question sent in by readers and putting it to experts in the field. This week's question comes to us from Julie in San Francisco. Julie asks:
How likely is it for a vaccinated person to catch delta and pass it on to another vaccinated person?
As the delta variant spreads rapidly throughout the U.S. and our Covid-19 rates climb, this question has been the subject of much discussion. It’s clear that breakthrough cases are happening, and to a certain extent, that was to be expected. No vaccine is 100% effective. That’s why it’s important for everyone to get vaccinated. The fewer hosts available to a virus, the less likely it is to spread.
The question now is whether those breakthrough cases are happening more frequently than we expected.
The short answer, says Monica Gandhi, an expert in infectious disease at the University of California, San Francisco, is that the jury is still out.
“We don’t’ know exactly how likely it is for a vaccinated person to catch delta and pass it on to a vaccinated person,” she says. “But the risk is likely very small.”
Gandhi says there has been a lot of confusing messaging. For example, take the
outbreak in Provincetown, Massachusetts, which garnered a lot of attention because the vast majority of the people who got Covid were vaccinated.
“The rate of mild symptomatic outbreaks in this population was higher because of a lot of indoor activity (including intimacy), rain that weekend, not much outside time and a mixture of people with different vax status,” says Gandhi. She also points out that the Provincetown outbreak provided further evidence that the vaccines are very good at preventing severe cases of illness.
More studies will be needed to get a clearer picture of the how easy it is for vaccinated people to get and transmit Covid-19.
In the meantime, says Gandhi, “although we do not know the exact quantification of a vaccinated person being able to pass on delta to another vaccinated person, simple microbiologic principles indicate that it is likely a low risk.”
Thanks to all of you for writing in this week! Next Sunday, we'll be answering the best question we receive again. So if you have any, we want to hear from you. Write to us at CovidQs@bloomberg.net—Kristen V. Brown
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August 15, 2021 at 06:30PM
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Can Vaccinated People Spread Delta? - Bloomberg
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