Sweden’s prime minister announced Thursday he has gone into protective self-isolation after a person close to him encountered someone who tested positive for the coronavirus. The country is experiencing an autumn surge of infections. From his Facebook account, Prime Minister Stefan Lofven said that on his doctor’s advice, he and his wife, Ulla, were self-isolating, even though they have no symptoms. He said it was “the only responsible thing to do in this situation.” Lofven’s announcement came as Sweden’s Public Health Agency reported a record 4,034 new daily infections and five new deaths, putting Sweden’s total deaths at 6,002. In his post, Lofven said the new infections were clearly going in the wrong direction. Early in the pandemic, as other Nordic nations locked down to fight the vir...