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China considers mixing COVID-19 vaccines

China's top disease control official has said the country is formally considering mixing COVID-19 vaccines, as a way of further boosting vaccine efficacy.

Available data shows Chinese vaccines lag behind others including Pfizer and Moderna in terms of efficacy, but require less stringent temperature controls during storage.

Gao Fu, the director of the Chinese Centers for Disease Control and Prevention on Saturday said that the currently available vaccines (quote) "don't have very high rates of protection"

Adding quote: "Inoculation using vaccines of different technical lines is being considered,"

Gao said that taking steps to "optimize" the vaccine process including changing the number of doses and the length of time between doses was a "definite" solution to the efficacy issues.

China has developed four domestic vaccines approved for public use and an official said on Saturday that the country will likely produce 3 billion doses by the end of the year.

A COVID-19 vaccine developed by China's Sinovac was found to have an efficacy rate of slightly above 50% in Brazilian clinical trials. A separate study in Turkey said it was 83.5% effective.

No detailed efficacy data has been released on vaccines made by China's Sinopharm.

A World Health Organization panel said in March that both vaccine makers have presented data on their COVID-19 vaccines indicating levels of efficacy in line with those required by the WHO.

China has shipped millions of its vaccines abroad, and officials and state media have fiercely defended the shots while calling into question the safety and logistics capabilities of other vaccines.