WASHINGTON—Children attending summer camp can get within 3 feet of each other but should wear masks to limit the spread of COVID-19, according to fresh guidance issued by the U.S. Centers for Disease Control and Prevention. The CDC’s updated recommendations for camps, issued on Saturday, have been eagerly awaited by parents as the end of the school year approaches. The agency said its camp guidance aligns with its evidence for social distancing at schools, with at least 3 feet between children—and at least 6 feet when eating and drinking. Camp counselors and other adults should stay at least 6 feet from children and each other, the CDC said. Summer camp activities should be held outdoors as much as possible, and if indoors, doors and windows should be left open when possible, the CDC said. Group events and large gatherings should be avoided, it added. COVID-19 vaccinations have ramped up across …