BRUSSELS - The United States joined Canada, the European Union and several other countries in instituting travel restrictions on visitors from southern Africa in a wave of international reactions to the a new, highly mutated coronavirus variant discovered by South African scientists.A World Health Organization panel named the variant "omicron" and classified it as a highly transmissible virus of concern, the same category that includes the delta variant, the world's most prevalent.
The panel said early evidence suggests an increased risk of reinfection.RELATED: South Africa variant: WHO calls special meeting on new COVID-19 mutationThe White House said the U.S.