PRO/AH/EDR> Influenza (11): USA (MI) influenza A(H3v) and (H1N2v) county fairs


A ProMED-mail post
ProMED-mail is a program of the
International Society for Infectious Diseases

Date: Sat 5 Aug 2023
Source: Outbreak News Today [edited]

The Michigan Department of Health and Human Services reported 2 human
infections with novel influenza A viruses in July [2023].

One patient, a Lapeer County resident who was an exhibitor at the
Oakland County Fair, was infected with an influenza A(H3) variant
(A(H3)v) virus, and the other patient, a Tuscola County resident who
attended the Tuscola County Fair, was infected with an influenza
A(H1N2)v virus.

Both patients are < 18 years of age, were not hospitalized, received
oseltamivir, and have recovered or are recovering from their illness.
No person-to-person transmission of variant influenza A viruses
associated with either patient has been identified. The investigations
are ongoing.

These are the 1st variant influenza A viruses reported in the United
States in 2023.

When an influenza virus that normally circulates in swine (but not
people) is detected in a person, it is called a “variant” influenza
virus. Most human infections with variant influenza viruses occur
following exposure to swine, but human-to-human transmission can
occur. It is important to note that in most cases, variant influenza
viruses have not shown the ability to spread easily and sustainably
from person to person.

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