I think there's like a half-dozen countries doing heterologous vaccination regimens. Here's a Wikipedia link about it https://en.m.wikipedia.org/wiki/COVID-19_v

I think there's like a half-dozen countries doing heterologous vaccination regimens. Here's a Wikipedia link about it https://en.m.wikipedia.org/wiki/COVID-19_vaccine_clinical_research#Heterologous_prime-boost_vaccination https://en.m.wikipedia.org/wiki/COVID-19_vaccine_clinical_re...