The scattered stories from across the nation can play like a merciless irony: Somebody assessments constructive for the coronavirus regardless that they’ve already obtained one or each doses of a Covid-19 vaccine.
It’s occurred to a minimum of three members of Congress lately:
How can that occur?
Consultants say instances like these usually are not stunning and don’t point out that there was one thing flawed 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 may already be contaminated and never realize it while you get the vaccine — even in the event you lately examined destructive. 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 approved primarily based on how effectively 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 maintaining you from passing it on to others. (That’s why vaccinated individuals ought to maintain sporting masks and sustaining social distance.)
Even one of the best vaccines aren’t good. The efficacy charges for Pfizer-BioNTech and Moderna vaccines are extraordinarily excessive, however they aren’t 100 %. With the virus nonetheless spreading uncontrolled within the U.S., a few of the hundreds of thousands of lately vaccinated individuals have been certain to get contaminated in any case.