Hmm, this is interesting. Hybrid immunity lasts 3 to 6 months. So 2-4 waves a year, every year. Just like the…

Hmm, this is interesting. Hybrid immunity lasts 3 to 6 months. So 2-4 waves a year, every year. Just like the flu. And unicorns. https://t.co/tT1Da1zbDk