Influenza A virus subtype H7N9

Influenza A virus subtype H7N9 is a subtype of the Influenza A virus that was first identified in humans in March 2013 in China. It is a particular concern for public health professionals because most patients have become severely ill and it has the potential to cause a pandemic.

Origin and Evolution

The H7N9 virus is a subtype of influenza that normally circulates among birds. It has also been found in humans, which is unusual for this type of virus. The first human infections were reported in China in March 2013. The virus has since spread to other countries, including the United States.

Transmission

The exact modes of transmission are not fully understood, but it is believed that humans may become infected through exposure to infected poultry or contaminated environments. Human-to-human transmission has been limited and has not occurred on a sustained basis.

Symptoms and Treatment

The symptoms of H7N9 infection typically include high fever, cough, and shortness of breath. Severe complications can include pneumonia and acute respiratory distress syndrome. Antiviral drugs, such as oseltamivir (Tamiflu), are currently the main treatment options for infected individuals.

Prevention

Prevention strategies for H7N9 include controlling the virus in birds, improving biosecurity in live poultry markets, and implementing public health measures such as surveillance and vaccination.

See Also

• Influenza A virus
• Influenza pandemic
• Avian influenza

Influenza A virus subtype H7N9

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  Ribbon diagram of neuraminidase
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  Chicken market in Xining, Qinghai province, China