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Seasonal Flu: H3N2 Influenza

Published: 2014-12-29 - Updated: 2020-11-04
Author: Public Health Agency of Canada | Contact: phac-aspc.gc.ca

Synopsis: H3N2 influenza is currently the most common strain of flu circulating in North America. The seasonal influenza vaccine is safe and effective and remains the best protection against influenza viruses. Everyone over the age of six months is encouraged to get the vaccine. If you are elderly and at high-risk of complications or if you are severely ill with the flu, consult your health care professional regarding early treatment with antiviral drugs to help manage the illness.

Main Digest

Seasonal influenza (The flu) is a serious illness that infects millions of Canadians every year. It is a common infectious respiratory disease that begins in the nose and throat. It is highly contagious and can spread rapidly from person to person. Flu cases result in approximately 12,200 hospitalizations and, on average, 3,500 deaths in Canada each year.

Related

So far this year, H3N2 influenza has been the most common strain circulating in North America. Seniors, those aged 65 and older, are usually the most affected by the H3 flu type.

Symptoms of The Flu

Influenza typically starts with a headache, chills and cough. Those are quickly followed by fever, loss of appetite, muscle aches and fatigue, running nose, sneezing, watery eyes and throat irritation. Nausea, vomiting and diarrhea may also occur, especially in children.

Most people will have uncomplicated influenza and recover from the flu within a week or ten days, but some are at greater risk of developing more severe complications such as pneumonia.

Symptoms of influenza illustration
Symptoms of influenza illustration

Who is Most at Risk?

Some people are more likely to get seriously ill if they catch the flu, including:

How to Avoid Getting The Flu

The seasonal influenza vaccine is safe and effective and remains the best protection against influenza viruses. Everyone over the age of six months is encouraged to get the vaccine.

It is especially important for those who are more likely to get seriously ill or suffer complications if they catch the flu. Getting the flu shot every year is important because the vaccine is reformulated annually to protect against the most current strains of the virus expected to be circulating during flu season. This year's flu vaccines were designed to protect against specific influenza viruses and strains that were expected to make people sick this winter.

Flu viruses are constantly changing which is why a flu vaccine is needed each year. Flu vaccine is made up of the flu strains that research suggests will cause the most illness in the upcoming flu season. The influenza A H3N2 strain circulating this year appears to have changed compared to the strain chosen for this season's vaccine. However, the vaccine can still provide some protection and remains the best way to protect yourself and your loved ones from the flu.

It's also important to remember that the flu vaccine protects against three or four flu viruses (depending on the type of vaccine you receive), so even when there is a less than ideal match or lower effectiveness against one virus, the vaccine will protect against the remaining two or three viruses.

In addition to getting the flu shot, you can protect yourself and your family from infection during flu season by taking the following steps:

If you are elderly and at high-risk of complications or if you are severely ill with the flu, consult your health care professional regarding early treatment with antiviral drugs to help manage the illness. It is important that antiviral drugs be started as early as possible after you get sick.

Flu Shots Are Highly Recommended For:

Canadians can keep track of their influenza immunizations with ImmunizeCA, an app that helps parents store and manage their families' vaccination records, easily access their provincial or territorial vaccination schedule as well as find timely and accurate information on the benefits of vaccination.

Primary Information Source(s):

Seasonal Flu: H3N2 Influenza | Public Health Agency of Canada (phac-aspc.gc.ca). Disabled World makes no warranties or representations in connection therewith. Content may have been edited for style, clarity or length.

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Cite This Page (APA): Public Health Agency of Canada. (2014, December 29). Seasonal Flu: H3N2 Influenza. Disabled World. Retrieved September 17, 2021 from www.disabled-world.com/health/influenza/h3n2-flu.php