Minnesota officials announced it has confirmed the first U.S. case of a highly transmissible variant that has been spreading in Brazil in recent weeks. Health experts are concerned that vaccines could be less effective against the so-called Brazil variant.

The Minnesota Department of Health said the case involved “a Minnesota resident with recent travel history to Brazil."

President Biden on Monday extended a ban on travelers from Brazil, the United Kingdom, Ireland and 26 other European countries that had been set to expire Tuesday. Biden also on Monday barred travelers from South Africa, where another virus variant emerged.

Here are some significant developments: