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here.ImageKatie Stallings, a second grade teacher, set up her classroom before her students return to school at MacFarlane Park IB Elementary, last week in Tampa, Fla.Credit...Octavio Jones for The New York TimesA judge struck down a state order requiring most Florida schools to open for in-person instruction.A Florida judge ruled on Monday that the state’s…

none of those cases have been confirmed with rigorous testing. Recovered people are known to carry viral fragments for weeks, which can lead to positive test results in the absence of live virus.But the Hong Kong researchers sequenced the virus from both of the man’s infections and found significant differences, suggesting that the patient had…