In a rare and puzzling turn of events, a third close contact of a patient in Missouri who was hospitalized with H5N1 bird flu has reported experiencing symptoms. This individual, a healthcare worker, was not tested as their symptoms resolved before the investigation into the illnesses began. The Centers for Disease Control and Prevention (CDC) has confirmed that two healthcare workers have now reported symptoms after being in contact with the patient.

The Missouri patient had underlying medical conditions that compromised their lung function, and the concentration of virus in a sample taken from them was low, suggesting a mild or perhaps waning infection. According to Dr. Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota, the index of concern remains low. However, the discovery of additional suspect cases this late into the investigation raises questions.

"It's unclear why this wasn't reported with the other cases, and moves to identify influenza cases early are needed," said Dr. Seema Lakdawala, an associate professor of microbiology and immunology at Emory University School of Medicine. The CDC has emphasized that the risk of H5N1 to the general population remains low.

The investigation is ongoing, and the CDC has collected blood samples from the patient and their household contact, who also developed symptoms. The samples have been sent to the CDC for testing for antibodies to the virus that causes bird flu, which would indicate a previous infection.

The Mysterious Case of the Bird Flu Outbreak

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