Update on H5N1 Bird Flu in Cambodia

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March 3, 2023

Flu Weekly Newsletter

Influenza (Flu)
2022 - 2023 Flu Season 

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Flu activity is low across the country, but annual flu vaccination is recommended as long as flu activity is ongoing.

Weekly U.S. Influenza Surveillance Report map showing intensity of flu infections
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Update on H5N1 Bird Flu in Cambodia

An update to a spotlight originally posted on February 25, 2023 provides results of a preliminary assessment of the H5N1 virus identified in one of two human infections detected in Cambodia in 2023 based on its genetic sequence and gives an update on the epidemiological investigation. There is still no indication of person-to-person spread associated with these two cases.
This is a picture of an influenza (flu) A virus. Influenza A viruses are classified by subtypes based on the properties of their hemagglutinin (H or HA) and neuraminidase (N or NA) surface proteins. There are 18 different HA subtypes and 11 different NA subtypes. Subtypes are named by combining the H and N numbers – e.g., A(H1N1), A(H3N2).

Types of Influenza (Flu) Viruses
Flu A and B viruses cause seasonal epidemics of disease in people (known as flu season) almost every winter in the United States. Current subtypes of flu A viruses that routinely circulate in people include A(H1N1) and A(H3N2). Flu A subtypes can be further broken down into different genetic “clades” and “sub-clades.” Learn more about the subtypes of flu viruses and how they are grouped.

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Many people mistakenly believe it is not safe to get a #flu shot while pregnant. This is not true. Flu shots are recommended during pregnancy and have an excellent safety record. Find studies here on flu vaccine safety: https://bit.ly/3YabstQ


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