A new variant of the coronavirus that may be more contagious has been found in a Colorado man who had not been travelling, triggering a host of questions about how the first US case of the new version showed up in the Rocky Mountain state.
The new variant was first identified in England, and infections are soaring now in Britain, where the number of hospitalised COVID-19 patients has surpassed the first peak of the outbreak in the spring.
The new variant has also been found in several other countries.
