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American Focus > Blog > Health and Wellness > Cause of Missouri H5 bird flu case remains a mystery, CDC says
Health and Wellness

Cause of Missouri H5 bird flu case remains a mystery, CDC says

Last updated: September 14, 2024 10:26 am
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Cause of Missouri H5 bird flu case remains a mystery, CDC says
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The mystery surrounding a person in Missouri who was infected with an H5 bird flu virus continues to baffle disease investigators. Despite no known exposures to animals or poultry, the individual contracted the virus, leaving health officials puzzled.

Nirav Shah, the principal deputy director of the Centers for Disease Control and Prevention (CDC), disclosed that the ongoing investigation has not yielded any evidence of the virus spreading further. This suggests that the case may be an isolated incident that defies explanation. Shah emphasized that the CDC’s surveillance system is designed to detect rare occurrences like this, but the origin of the infection remains unknown.

One complicating factor is the inability to determine the full subtype of the H5 virus due to low RNA levels in the patient’s specimen. The CDC is striving to identify the neuraminidase component of the virus, although it may not be feasible in this instance. Without a complete genetic sequence, further analysis is challenging.

Despite these obstacles, analysis conducted by the CDC indicates that the hemagglutinin protein of the virus is closely related to H5 viruses found in dairy cow herds across multiple states. Missouri, however, is not among the states reporting outbreaks in dairy cattle.

Since the virus was first identified as the cause of decreased milk production in dairy cattle in late March, the U.S. Department of Agriculture has confirmed 203 infected herds. The outbreak likely originated in the Texas Panhandle in late 2023 or early 2024, spreading from wild birds to cattle and subsequently between farms.

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Missouri’s Department of Health and Senior Services is spearheading the investigation, with the infected individual having fully recovered and cooperating with authorities. Discussions are underway to collect blood samples from the person and close contacts to test for antibodies, potentially uncovering undetected infections.

The individual sought medical attention on Aug. 22 with atypical influenza symptoms and pre-existing health conditions. A flu test revealed the presence of the mysterious H5 infection during the diagnostic process. Shah noted that tracing novel flu viruses to their source is challenging, citing similar instances in previous outbreaks.

In response to the situation, the CDC is collaborating with commercial diagnostic test manufacturers to develop tests for H5N1 and Oropouche virus. The initiative aims to enhance preparedness for future outbreaks, learning from past challenges faced during the COVID-19 pandemic.

Meanwhile, the USDA is employing bulk tank testing in California to assess the extent of the H5N1 outbreak in dairy cattle. The state, a key dairy producer, has identified eight infected herds and continues to test linked operations for further infections. With more herds under scrutiny, California is intensifying efforts to contain the spread of the virus.

The evolving investigation underscores the importance of vigilance in monitoring and responding to emerging infectious diseases. As health agencies collaborate to address the Missouri H5 bird flu case and enhance preparedness for future threats, the public health community remains focused on safeguarding public health and preventing the spread of infectious diseases.

TAGGED:BirdcaseCDCFluMissouriMysteryremains
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