https://ift.tt/2wwdHAe Need a Flu Shot? Get It Now Influenza, Vaccination and Immunization, Tamiflu (Drug), Relenza (Drug) Immunity tends to wane by 20 percent a month, leaving those who got their shot in August or September with less than desirable protection by the time they’re exposed. JANE E. BRODY https://ift.tt/2Pb0FRF November 5, 2018 at 05:30AM