The scattered experiences from across the nation can play like a merciless irony: Somebody checks optimistic for the coronavirus regardless that they’ve already obtained one or each doses of a Covid-19 vaccine.
It’s occurred to not less than three members of Congress lately:
How can that occur?
Consultants say instances like these should not stunning and don’t point out that there was one thing improper with the vaccines or how they have been administered. Right here is why.
Vaccines don’t work immediately. It takes a couple 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 couple of weeks after the primary to achieve full effectiveness.
Nor do they work retroactively. You possibly can already be contaminated and never comprehend it whenever you get the vaccine — even for those who lately 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 optimistic take a look at end result.
The vaccines stop sickness, however perhaps not an infection. Covid vaccines are being approved primarily based on how effectively they preserve 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 conserving you from passing it on to others. (That’s why vaccinated folks ought to preserve sporting masks and sustaining social distance.)
Even the very best vaccines aren’t excellent. 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., among the hundreds of thousands of lately vaccinated folks have been certain to get contaminated in any case.