China's Covid-19 vaccine sales drop as nations switch to mRNA shots | World News - Hindustan Times

China's Covid-19 vaccine sales drop as nations switch to mRNA shots | World News - Hindustan Times: The efficacy of China’s inactivated vaccines ranges from about 50% to 80% in clinical trials. But they are less potent than mRNA vaccines and questions are mounting about their effectiveness against the highly transmissible delta variant. | World News