After ~6 months they are noticeably less effective, although IIRC it's a drop from like 96% reduction in death rate to 85%. It's gradual too, not instantaneous, again if I'm not misremembering.
This is the reason they're talking about doing booster shots.
After ~6 months they are noticeably less effective, although IIRC it's a drop from like 96% reduction in death rate to 85%. It's gradual too, not instantaneous, again if I'm not misremembering.
This is the reason they're talking about doing booster shots.