Recommended Timeline for Influenza Vaccinations Recommended Timeline for Influenza Vaccinations* CDC recommends high-risk groups also receive pneumococcal vaccine, which can be administered any time of the year OCT NOV DEC JAN† High-risk persons of any age, healthcare workers Healthy persons 50-64 years of age All persons *CDC. Updated Recommendations from the Advisory Committee on Immunization Practices in Response to Delays in Supply of Influenza Vaccine for the 2000-01 Season. MMWR 2000; 49 (No. 39): 888-891 †Vaccination may be administered after January, depending on vaccine availability, population at risk and influenza activity