April 14, 2021, 02.22 PM
An illustration of China's Sinovac vaccine. ANTARA FOTO/Aji Styawan/aww. ANTARA FOTO/AJI STYAWANAn illustration of China's Sinovac vaccine. ANTARA FOTO/Aji Styawan/aww.

KOMPAS.com - China's top disease control official says 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 Center for Disease Control and Prevention, said on Saturday that giving people doses of different vaccines is one way to improve vaccines that, "don't have very high rates of protection."

"Inoculation using vaccines of different technical lines is being considered."

Also readIndonesia to Get 140 Million Doses of Sinovac Covid-19 Bulk Vaccine Soon

He did not specify if he was referring to foreign or domestic vaccines.

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 efficacy issues.

Two injections of a vaccine developed by China's Sinovac Biotech, when given less than three weeks apart, was 49.1 percent effective based on data from a phase 3 trial in Brazil.

This was below the 50 percent threshold set by World Health Organization (WHO), according to a paper published by Brazilian researchers on Sunday ahead of peer review.

But data from a small subgroup showed the efficacy rate increased to 62.3 percent when the doses were given at intervals of three weeks and longer.

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