Several coronavirus variants with the potential to be more transmissible have caused global concern over whether existing vaccines will still protect the world from a virus […]
Health officials have rolled out more than 500 million coronavirus vaccine doses around the world, according to an AFP tally on Friday, as European rows over […]
Sao Paulo’s Butantan biomedical institute announced on Friday it is developing a “100 percent Brazilian” vaccine against COVID-19 and expects to start using it in July.