By Jovana Gec and Nick PerryThe Associated PressBELGRADE, Serbia — The European nation of Serbia mulled how to curb accelerating coronavirus infections following two nights of clashes involving anti-lockdown demonstrators, while the virus showed no sign of slowing Thursday in the countries with the highest caseloads — the United States, India and Brazil. The three nations on separate continents are accounting for more than 60% of new confirmed cases, according to recent tallies from Johns Hopkins University.Read more on NewsOK.com