Pictured are pigs in this undated photo. A human case of the swine flu, otherwise known as the influenza A H3N2 variant, has been detected in Ingham County, according to the Michigan Department of ...

Specifically, the CDC notes that H1N1- and H3N2-related variants, both type A flu strains, are the predominant flu viruses circulating this season. Watch NBC 4 free wherever you are.

Instead of the H1N1 strain, which was included in the vaccine formula, more people contracted the H3N2 variant. If the U.S. follows the same pattern, similar levels of protection are expected.

Vaccine makers choose one variant of type A H1N1, a variant of H3N2 and a B flu strain from a particular lineage, the CDC explains. Previously, ...

Vaccine makers choose one variant of type A H1N1, a variant of H3N2 and a B flu strain from a particular lineage, the CDC explains. Previously, ...

Vaccine makers choose one variant of type A H1N1, a variant of H3N2 and a B flu strain from a particular lineage, the CDC explains. Previously, ...

When new variants go up and immunity goes down, “we tend to see the increase in cases,” said Michael T. Osterholm, ... H1N1 and H3N2 – and some influenza B, the CDC found.

A human case of the swine flu, otherwise known as the influenza A H3N2 variant, has been detected in Ingham County, according to the Michigan Department of Health and Human Services, or MDHHS.

Vaccine makers choose one variant of type A H1N1, a variant of H3N2 and a B flu strain from a particular lineage, the CDC explains. Previously, ...

Vaccine makers choose one variant of type A H1N1, a variant of H3N2 and a B flu strain from a particular lineage, the CDC explains. Previously, ...