supported by the National Key Research and Development Program of China(grant number 2021YFC0863300);General Program of the National Natural Science Foundation of China(grant number 82073621,32070678&82172244);Beijing Municipal Science and Technology Project(Z211100002521018);the Bill&Melinda Gates Foundation(Investment ID INV-006379).
A steep rise in Omicron reinfection cases suggests that this variant has increased immune evasion ability.To evaluate its antigenicity relationship with other variants,antisera from guinea pigs immunized with spike pr...