3 ms·
It isn't entirely irrelevant. If you can get reinfected but not get sick twice, it's as if we reached herd immunity at 100%. And it's perfectly normal that ant
by anoncake 6y ago
It isn't entirely irrelevant. If you can get reinfected but not get sick twice, it's as if we reached herd immunity at 100%.
And it's perfectly normal that antibodies don't stay in the bloodstream forever. The immune system remembers how to make them and can produce new ones when needed.