4 ms·
Could they really manage to make a new version of the vaccine four times a year? For influenza they only do it twice a year and the vaccines are often only 50
by catalogia 6y ago
Could they really manage to make a new version of the vaccine four times a year? For influenza they only do it twice a year and the vaccines are often only 50% effective (or worse.)
- sershe 6y agoI would assume this is because of how fast flu is evolving and how many strains there are, with different ones predominant in any given year. Covid is (relatively) stable, so you'd just use the same one.
- catalogia 6y agoIf it's stable, wouldn't immunity be stable too? Or is immunity decay a matter of your immune system being unstable, rather than the virus?