Sweden has not banned public gatherings like most countries have because of the coronavirus pandemic.Crowds recently gathered near the waterfront in Stockholm to enjoy the sun.Anders Tegnell said he is not worried. He is the country's medical official leading the fight against the coronavirus pandemic.The 63-year-old has become famous in Sweden. He appears on television every day. He tries to calmly explain the development of the outbreak.Countries across Europe have restricted the movement of their citizens, but Sweden has not. Tegnell says Sweden is finding a different way that is more "sustainable."Sweden is using what some call herd immunity. This can involve letting people become infected so that large numbers of people develop immunity in the population.President Donald Trump has said that Sweden is suffering as the result."Sweden did that -- the herd. They called (it) the herd. Sweden is suffering very, very badly. It's a way of doing it," he said.But Swedish Health Minister Lena Hallengren recently told The Associated Press that the country is not trying herd immunity.