Over the past few days, several European and North American countries have reported cases of the rare virus.

Over the past few days, several European and North American countries have reported cases of the rare virus.
Belgium expels 21 Russian diplomats over alleged spying amid similar moves elsewhere in the European Union.
Czech prosecutors charge former Prime Minister Andrej Babis and his aide in a $2.2m EU subsidy fraud case.
Travelling by train, the three leaders are set to become the first to visit Ukraine’s capital since Russia’s invasion.
The move comes as the billionaire faces charges over EU subsidy fraud involving his farm outside Prague.
European nations say FIFA’s measures are inadequate, call for Russia to be expelled from World Cup.
Poland, Slovakia and other states are ready to welcome Ukrainians fleeing tensions with Russia.
Czech Prime Minister Petr Fiala inherits several big challenges, from soaring inflation to the continuing pandemic.
Fiala leads a bloc of five parties that controls 108 seats in the 200-member lower house of parliament.
President, 77, leaves military hospital in Prague and will name Petr Fiala as prime minister on Sunday, his office says.
Two EU members will impose restrictions on unvaccinated people as Europe faces a rise in coronavirus infections.
Surge comes amid sluggish mass vaccination campaign and as neighbouring countries also face uptick in cases.
Major step taken towards replacing outgoing administration of Prime Minister Andrej Babis following October election.
Senate speaker says hospitalised President Milos Zeman unable to work, seeks to shift duties to other officials.