So far, about 5,800 “breakthrough” cases have been reported to the CDC, Xinhua news agency quoted the agency as saying on Thursday.
Vaccine breakthrough infections make up a small percentage of people who are fully vaccinated, less than 1 percent, according to the CDC.
Among the 5,800 “breakthrough” cases, some became seriously ill and 74 people died, it said.
Meanwhile, 396 cases, 7 percent of those who got infected after they were vaccinated, required hospitalisation.
The health agency called on all eligible people to get a Covid-19 vaccine as soon as possible and urged fully vaccinated individuals to keep up precautions, such as wearing masks and social distancing, to avoid contracting the disease.