A lab technician in Personal Protective Equipment (PPE) looks at a reagent bottle before performing vaccine tests at a French pharmaceutical company Sanofi’s laboratory in Val de Reuil on July 10, 2020.

Two coronavirus vaccine candidates have proven safe for humans and produced strong immune reactions among patients involved in separate clinical trials, doctors said Monday.

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.

The authors of the studies said that they encountered a few adverse side effects from the vaccine candidates.

However, they cautioned that more research was needed, particularly among older adults, who are disproportionately at risk of dying of COVID-19.

Co-author Sarah Gilbert from the University of Oxford said the results “hold promise”.

“If our vaccine is effective, it is a promising option as these types of vaccine can be manufactured at a large scale.”

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Coronavirus: Two Vaccines Proven Safe For Human – Research