MIAMI—A vaccinated Miami-Dade county commissioner who helped other local officials in Surfside following the collapse of a condominium building announced that he and his chief of staff tested positive for COVID-19. The news release late Sunday from Miami-Dade County Commission Chairman Jose “Pepe” Diaz said he and his chief of staff Isidoro Lopez, who also received a vaccine against the virus, came down with flu-like symptoms earlier in the day and later tested positive. “Staff and others who have been in close contact with them will be getting tested between today and tomorrow,” the news release said. The statement also said Diaz and Lopez would be isolating and following guidelines from the Centers for Disease Control and Prevention. Diaz had participated in news conferences and meetings with other officials in Surfside, the Miami Herald reported. Miami Dade spokesperson Rachel Johnson told the newspaper that COVID-19 tests would be administered at …