The scattered reviews from across the nation can play like a merciless irony: Somebody checks constructive for the coronavirus though they’ve already acquired one or each doses of a Covid-19 vaccine.
It’s occurred to not less than three members of Congress not too long ago:
How can that occur?
Consultants say circumstances like these aren’t stunning and don’t point out that there was one thing fallacious with the vaccines or how they had been administered. Right here is why.
Vaccines don’t work immediately. It takes a number of weeks for the physique to construct up immunity after receiving a dose. And the vaccines now in use within the U.S., from Pfizer-BioNTech and Moderna, each require a second shot a number of weeks after the primary to succeed in full effectiveness.
Nor do they work retroactively. You’ll be able to already be contaminated and never comprehend it whenever you get the vaccine — even should you not too long ago examined unfavourable. That an infection can proceed to develop after you get the shot however earlier than its safety absolutely takes maintain, after which present up in a constructive take a look at outcome.
The vaccines stop sickness, however perhaps not an infection. Covid vaccines are being licensed primarily based on how properly they maintain you from getting sick, needing hospitalization and dying. Scientists don’t know but how efficient the vaccines are at stopping the coronavirus from infecting you to start with, or at holding you from passing it on to others. (That’s why vaccinated people should keep wearing masks and sustaining social distance.)
Even the perfect vaccines aren’t good. The efficacy charges for Pfizer-BioNTech and Moderna vaccines are extraordinarily excessive, however they don’t seem to be 100%. With the virus nonetheless spreading uncontrolled within the U.S., a few of the hundreds of thousands of not too long ago vaccinated individuals had been certain to get contaminated in any case.