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Influenza, Northern Hemisphere

2022-2023 Seasonal Influenza Resource Center

Flu disease picture  Influenza is a highly contagious viral infection. There are three main antigen types of influenza: types A, B, and C. Influenza type A causes moderate to severe illness and affects all age groups. Type A can infect both humans and animals. The notion that influenza type B generally causes milder disease than type A has been recently challenged and is more fatal in children. Type B mainly infects humans. Influenza type C only causes mild respiratory illness. Influenza activity peaks from December to March in the Northern Hemisphere.

Influenza is transmitted from person to person mainly when an infected person coughs or sneezes. Transmission can also occur from direct contact with respiratory secretions, such as when touching surfaces contaminated with influenza virus and then touching the eyes, nose, or mouth, or from indirect contact with droplets from coughs or sneezes. Transmission can occur from the day before symptoms begin until about 5 days after symptoms begin in adults, or up to 10 days or more after symptoms begin in children.

About 50% of infected persons will develop "classic" influenza disease. This is characterized by the abrupt onset of fever, muscle pain, sore throat, nonproductive cough, runny nose, and headache. These symptoms generally last from 2 to 3 days. However, some people may experience a loss of strength or energy for several weeks. In addition, some people may develop complications, such as pneumonia.

Source: Centers for Disease Control and Prevention

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Standing orders for Administering Influenza Vaccine to Children and Adolescents


The purpose of this standing order is to reduce morbidity and mortality from influenza by vaccinating children and adolescents who meet the criteria established by the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices (ACIP) and the Department of Defense (DOD).

DHA Form 116: Pediatric and Adult Influenza Screening and Immunization Documentation


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Rates of flu vaccination among service members are significantly higher than in previous years.

Flu Shots are Available Now And Are More Important than Ever

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It’s flu season. Get vaccinated. COVID-19 concerns should redouble desire to get vaccinated against the flu.

Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices


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Influenza Infection and Influenza Vaccine

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The purpose of this information paper is to describe influenza disease and supporting vaccines to prevent its spread.

Military Health System encourages influenza vaccination for 2020

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MMQC-20-1172 Disposition Instructions for 2019-2020 Influenza Virus Vaccine


The U.S. Army Medical Materiel Agency Distribution Operations Center (USAMMA DOC) provides disposition guidance on the expired/expiring 2019-2020 influenza vaccine.

Pediatric Influenza 2nd Dose Reminder Cards


A pre-designed reminder card for parents whose children are being immunized against influenza for the first time, thus requiring two doses of vaccine separated by at least 28 days.

Influenza Off-Site Vaccination Clinic Supply Checklist


A checklist of suggested supplies for an off-site influenza clinic.

Standing orders for Administering Influenza Vaccine to Adults 2020-21


The purpose of this standing order is to reduce morbidity and mortality from influenza by vaccinating adults who meet the criteria established by the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices (ACIP) and the Department of Defense (DoD).

Influenza Vaccine Product List and Age Groups 2019-20


A list of available influenza vaccines for the 2019-20 flu season, along with age indications and other product specifications.

MMQC-19-1891 Disposition Instructions for 2018-2019 Influenza Virus Vaccine


In preparation for the upcoming 2019-2020 influenza season, activities can follow this disposition guidance for influenza vaccine from the previous season.

Guidance for the 2018-2019 Annual Influenza Immunization Program


ASD(HA) memo detailing the forthcoming immunization requirements for the 2018-19 influenza season.

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Last Updated: May 05, 2023
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