On August 7, the Central Epidemic Command Center (CECC) pointed out that frontline medical personnel in COVID-19 designated healthcare facilities (including designated COVID-19 wards, negative pressure isolation wards, or testing hospitals) are expected to be allowed in phases to use the Moderna vaccine as their second dose starting the next week if they received a first dose of the AstraZeneca vaccine (AZ vaccine) at least 10 weeks before their second dose.