‘It’s going to take four to five years until everyone gets the vaccine on this planet,’ says Adar Poonawalla, chief executive of the Serum Institute of India. Photograph: iStock

The chief executive of the world’s largest vaccine manufacturer has warned that not enough Covid-19 vaccines will be available for everyone in the wor(...)

Officials pile dead chickens into bags in Hong Kong earlier this year in a mass cull after the deadly H7N9 virus was discovered in poultry imported from mainland China. Photograph: Philippe Lopez/AFP/Getty Images

US virologist Yoshihiro Kawaoka has form when it comes to sparking controversy. Last month, his team at the University of Wisconsin-Madison publish(...)