The US Centers for Disease Control and Prevention is urging hospitals to accelerate advanced testing of people they suspect may have bird flu.

A child in San Francisco was recently confirmed to be the third human case of bird flu in the United States in which it's unclear how the person got infected. Cases have been spreading across the country since April 2024 with 67 confirmed as of Thursday,

The CDC is calling for expanded testing of bird flu after a child in California tested positive for the virus despite no known contact with animals.

Public health officials have confirmed a San Francisco child is the second pediatric case of bird flu in the U.S. According to the CDC, no additional cases have been identified among the child's contacts.

Health officials in San Francisco announced Friday that they are investigating a presumptive case of H5N1 bird flu that was found in a child who lives in the city.

The CDC has confirmed a positive bird flu case in a child in San Francisco, the second juvenile case of H5N1 in the country.

The CDC is monitoring developments closely because the United States is in the middle of flu season. With more patients flooding hospitals seeking care for seasonal flu, testing for avian influenza could slow down, and that could delay public health measures needed to prevent disease spread.

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Norovirus, commonly known as the “stomach bug” or “winter vomiting disease,” causes acute gastroenteritis, or an inflammation of the stomach or intestines. The stubborn virus is one of the most common causes of vomiting, diarrhea and stomach cramps, according to the California Department of Public Health.

San Francisco’s public health director, who oversaw the city’s responses to the COVID-19 pandemic and fentanyl crisis, announced his resignation this week. Dr. Grant Colfax is stepping down after spending nearly six years as the city’s leading health official.

After the holiday season and an uptick in travel, California faces a rise in respiratory illnesses, prompting health experts to talk of a “quad-demic.” The term refers to the simultaneous spread of four major viruses: COVID-19,