Several countries find cases of new variant

Canada, France, Japan, Spain and Norway have found small numbers of infections involving a new, potentially more transmissible variant of the coronavirus, most linked to travel from Britain, where it was first detected.

The rapid spread of the variant led to the lockdown of London and southern England, prompted a temporary French blockade of the English Channel and resulted in countries around the world barring travelers coming from Britain. Because few countries have the level of genomic surveillance that Britain does, there is concern that the variant may have been traveling across the world undetected for weeks.

A recent study by British scientists found no evidence that the variant was more deadly than others but estimated that it was 56 percent more contagious.

The British variant has been diagnosed in seven people in Japan, the country’s health ministry said.

In Spain, the variant was found in the capital region, local authorities said Saturday.

In France, the first case of the new variant was identified Friday, according to the country’s health ministry.

Officials in Sweden said Saturday that a case of the variant had been detected there, Reuters reported.

Health officials in Ontario, Canada, said Saturday that they had confirmed two cases of the variant in the province.

And Sunday, the Institute of Public Health in Oslo reported that two travelers from Britain who had entered Norway this month had the new variant, according to Reuters.

It is normal for viruses to mutate, and most of the coronavirus mutations have proved minor. The British variant has a constellation of 23 mutations, several of which might alter its transmissibility. Vaccine experts are confident that the available vaccines will be able to block the new variant, although that has to be confirmed by laboratory experiments that are now underway.

Germany, the Netherlands, Lebanon, Australia and Singapore have identified infections with the new variant. And Denmark, which has wider genomic surveillance than many other countries, detected 33 cases of it from Nov. 14 to Dec. 14, according to Danish health authorities.

The United States has not yet reported any cases of the British variant.