An 8-week interval between COVID-19 vaccines may reduce the risk of side effects.
Evidence from the U.K. and Canada suggests that an 8-week interval between COVID-19 vaccine doses is associated with higher antibody responses, better vaccine effectiveness against SARS-CoV-2 infection and hospitalization, and reduced myocarditis risk.
A potential downside of the 8-week interval is that an individual’s risk of getting COVID-19 likely increases the longer they are only partially vaccinated with a single dose.
Parvathy Sukumaran 
