3 ms·
Its effectiveness has on average been less than 50% in the past decades, sometimes far lower. There's just too many strains and to much seasonal variability.
by gridlockd 7y ago
Its effectiveness has on average been less than 50% in the past decades, sometimes far lower. There's just too many strains and to much seasonal variability.
- mohaine 7y agoBut they usually also decrease the severity of the symptoms, even when they don't completely block them. This is almost as important as the full effectiveness as helps decreases death and hospital time.