Two coronavirus vaccine candidates have proven safe for humans and produced strong immune reactions among patients involved in separate clinical trials, doctors have said.
The first trial among more than 1,000 adults in Britain found that the vaccine induced "strong antibody and T cell immune responses" against the novel coronavirus.
A separate trial in China involving more than 500 people showed most had developed widespread antibody immune response. The studies, published in The Lancet medical journal, constitute a major step on the road towards a Covid-19 vaccine that is effective and safe for widespread use.