In a rare admission of the weakness of Chinese coronavirus vaccines, the country’s top disease control official says their effectiveness is low and the government is considering mixing them to get a boost. Chinese vaccines “don’t have very high protection rates,” said the director of the Chinese regime’s Centers for Disease Control (CDC), Gao Fu, at a conference on April 10 in the southwestern city of Chengdu. Beijing has distributed hundreds of millions of doses abroad while trying to promote doubt about the effectiveness of the Pfizer-BioNTech vaccine made using the previously experimental messenger RNA, or mRNA, process. “It’s now under formal consideration whether we should use different vaccines from different technical lines for the immunization process,” Gao said. Officials at a news conference Sunday didn’t respond directly to questions about Gao’s comment or possible changes in official plans. But another CDC official said developers are working on mRNA-based vaccines. …