The British government on Monday urged older people and volunteers from black and Asian minorities to register for a trial of a new coronavirus vaccine to step up efforts to find an effective vaccine to prevent the disease and protect higher risk groups. < / P > < p > currently, there are about 20 vaccines in clinical trials worldwide, but no candidate vaccine has been proven to be effective against the virus. More than 100000 people have signed up for vaccine trials voluntarily, but more volunteers are needed to determine if the candidate vaccine is effective for everyone, the Commerce Department said. “Protecting people at risk is the only way we can end the epidemic,” said Kate Bingham, head of the UK vaccine working group < / P > < p > “100000 volunteers is a great start, but if we are to quickly find a vaccine to protect those who need it, we need more people from different backgrounds and call on them for future research.” < / P > < p > a study last week showed that ethnic minorities are two to three times more likely to be infected with the new coronavirus than whites. Minority groups also have a disproportionate number of deaths from the disease.