October 22, —CDC today reported two new U. One of these variant influenza virus infections is the first to occur during the flu reporting season i. Variant virus infections occur rarely, and usually in the context of exposure to pigs when they happen. However, there have been a small proportion of such infections where the original source of exposure to a pig cannot be readily identified. When this happens, the possibility of limited human-to-human spread of a variant influenza virus cannot be ruled out.
That means the virus may have passed from a pig to an intermediary person who then spread the virus to the patient in whom the virus was detected. There is epidemiologic follow-up for every case reported to try to identify any such intermediary persons and to make sure there is no ongoing spread of the virus in question. Of the two just-reported variant influenza virus infections, one of the patients had contact with pigs prior to illness onset; but in the other case, no known direct or indirect swine exposure has been identified.
It is possible that limited human-to-human spread occurred in this case, however, no ongoing human-to-human spread has been identified with either patient. These viruses have important antigenic and genetic differences from seasonal influenza A viruses that circulate worldwide among people.
The two newest infections, one an H3N2v virus and the other an H1N1v virus, occurred in children. Neither child was hospitalized, and both have recovered or are recovering from their illness. Illnesses associated with variant influenza virus infections have been mostly mild with symptoms similar to those of human seasonal influenza.
However, variant influenza virus infections also can cause serious illness, resulting in hospitalization and death. Fauci explains why CDC changed Covid isolation guidelines. Massachusetts schools use dogs to sniff out Covid Trudeau doesn't rule out taxing unvaccinated amid legal, ethical concerns.
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It's bad news for the vaccine, he said. Influenza vaccines protect against four different strains of the flu: H3N2, H1N1 and two strains of influenza B. Hensley's study only covers H3N2, but that happens to be the main circulating strain. The vaccine mismatch may help explain an outbreak of flu at the University of Michigan last month that affected more than people. That indicates the vaccine was not effective in preventing infection. It's what flu viruses do, Hensley said. Decreases in influenza, other viral infections doesn't mean those viruses have gone away Jan 25, Oct 25, Oct 14, Recommended for you.
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