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The woman had amebic meningoencephalitis, a rare, often fatal brain infection caused by the ameba Naegleria fowleri.
Some of the latest cases are tied to a large outbreak centered in West Texas, while others are linked to instances of community transmission or travel to other states or countries.
The increase in activity is seen in the Western Pacific, Southeast Asia, and Eastern Mediterranean regions.
Preschool-aged children were more likely to have a dry cough and daytime tiredness or low energy.
Experts say illnesses don't seem more severe and more studies are needed to further assess the risk of antibody escape.
Neutralizing antibodies tested 90 days after infection were greater in participants who had been vaccinated before their variant infections than in those who had been vaccine-naive.
Buoyed by promising clinical findings, Moderna says it will explore alternatives for late-stage development of the H5 vaccine.
Other states report more cases, including Minnesota, with two, one of which involves a child whose infection suggests community spread.
Iowa's patient is an unvaccinated adult, and Nebraska's is a vaccinated child who had not traveled outside the state.
The company's "next-generation" COVID-19 vaccine, mNexspike, was approved for adults 65 and older and younger people at risk of severe disease.
