Source: China – South China Morning PostA booster shot of CanSino’s Covid-19 vaccine after two doses of Sinovac can induce a much stronger immune response than a third Sinovac shot, research suggests.The study, published on medRxiv.org and which has not been peer reviewed, comes as Beijing has offered booster shots for the elderly, high-risk groups and people travelling abroad but has not allowed the mixing of different types of vaccines.Zheng Zhongwei, director of the National Health Commission’s Development Centre for Medical…Read More