Wash your hands. While authorities say the number of U.S. doctor visits for flu-like symptoms stayed steady in early February at about 1 in 13 — a sign that this year’s deadly flu season may be leveling off — the danger’s not over. The number of children who died of the flu spiked by 22 in the latest weekly report. About three-quarters of the estimated 84 children who have died so far weren’t fully vaccinated. Doctors say the nation’s bout with H3N2 is expected to continue into the spring.