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.<br /><br />Available data shows Chinese vaccines lag behind others including Pfizer and Moderna in terms of efficacy, but require less stringent temperature controls during storage.<br /><br />The currently available vaccines "don't have very high rates of protection", Gao Fu, the director of the Chinese Centers for Disease Control and Prevention, told a conference in the Chinese city of Chengdu on Saturday.
