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Influenza, Southern Hemisphere

Southern Hemisphere Influenza Vaccine Resource Center

Influenza is a world-wide contagious respiratory illness caused by influenza viruses. The virus is spread through close contact with an infected person. The incubation period is commonly 2 days, but ranges from 1 to 4 days. Due to its short incubation period, influenza outbreaks may escalate very quickly, especially in highly susceptible populations. Influenza illness is characterized by the abrupt start of fever, sore throat, headache, myalgia, non-productive cough and extreme fatigue with major symptoms lasting an average of 2 to 3 days. Fever usually ranges between 100° and 104°F. Illness typically improves within a week, but cough and malaise may persist for 2 or more weeks. The most common complications of influenza is pneumonia, but may include exacerbation of underlying chronic pulmonary and cardiopulmonary diseases, such as chronic obstructive pulmonary disease, asthma, and congestive heart failure.

There are many brands of Northern Hemisphere influenza vaccines available. Recently, one brand of vaccine for Southern Hemisphere influenza vaccine became available in the United States. 

Northern Hemisphere influenza vaccine will be administered to all assigned to an area designated as a Northern Hemisphere influenza zone between October and April. Southern Hemisphere influenza vaccine will be administered to all permanently or temporarily assigned to an area designated as a Southern Hemisphere influenza zone between April and October. Northern and Southern Hemisphere-designated countries will be identified by the Defense Health Agency or the Type/Combatant Command to which an individual may be permanently or temporarily assigned.  Personnel traveling to either the Northern or Southern Hemisphere during that hemisphere’s influenza season should be vaccinated at least two weeks prior to entry into the region.  Northern and Southern Hemisphere influenza vaccines should be separated by at least 28 days.

Resource Center

You will find below all of the resources you will need for the Southern Hemisphere influenza season. More will be added as they are published or released.

Policy Date
Defense Health Agency-Procedural Instruction 6025.34: Guidance for the DOD Influenza Vaccination Program
Aug. 21, 2020
Information Paper Date
Influenza Infections and Influenza Vaccine
Aug. 19, 2021
Vaccine Information Statements Date
Live, Intranasal Flu Vaccine
Aug. 6, 2021
Inactivated or Recombinant (injectable) Flu Vaccine
Aug. 6, 2021
Screening Form Date
Pediatric and Adult Influenza Screening and Immunization Documentation, Version 5 (This document is current for the 2023-24 influenza season.)
Last Modified: August 2023
Originally Published: February 2020
Standing Orders Date
Influenza Vaccines for Children and Adolescents
Sept. 7, 2023
Influenza Vaccines for Adults
Sept. 7, 2023
Competency Assessment Date
Initial/Annual Competency Assessment Checklist: INFLUENZA VACCINE ADMINISTRATION
Aug. 11, 2023
Package Inserts Date
Afluria (Quadrivalent) Southern Hemisphere
Feb. 17, 2022
Fluzone (Quadrivalent) Southern Hemisphere
Nov. 2, 2022
Influenza Vaccine Product List Date
Influenza Vaccine Product List and Age Groups 2023-24 Aug. 24, 2023

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Last Updated: October 23, 2023
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