PRO/EDR> COVID-19 update (11): variants, China, neutralizing ab. regional, WHO, global

COVID-19 — China
Mutations arise as a natural by-product of viral replication.1 RNA viruses typically have higher mutation rates than DNA viruses. Coronaviruses, however, make fewer mutations than most RNA viruses because they encode an enzyme that corrects some of the errors made during replication. In most cases, the fate of a newly arising mutation is determined by natural selection. Those that confer a competitive advantage with respect to viral replication, transmission, or escape from immunity will