H7N9 is a subtype of avian influenza. The outer wax of influenza virus particles is covered by two types of surface glycoproteins, one is phytohemagglutinin (H) and the other is neuraminidase (N). H is divided into 15 subtype, and n is divided into 9 subtype. All human influenza viruses can cause avian influenza, but not all avian influenza viruses can cause human influenza. Among avian influenza viruses, H5, H7 and H9 can be transmitted to people, and H5 is highly pathogenic. According to the characteristics of influenza virus, it can be divided into HNX * * * 135 subtype, and H7N9 subtype avian influenza virus is one of them. Previously, it was only found in birds, and no human infection was found. The biological characteristics, pathogenicity and transmission route of this virus have not been analyzed and judged.
H7N9 avian influenza is a new type of avian influenza, which was first discovered in Shanghai and Anhui at the end of March 20 13. H7N9 avian influenza is a new subtype of influenza virus discovered for the first time in the world. It was not included in the surveillance and reporting system of notifiable infectious diseases in China, and the vaccine was not introduced until the beginning of October1March.
symptom
Symptoms of acute respiratory infection such as fever and cough, especially high fever and dyspnea.
counter-measure
After the case appeared, the local health department attached great importance to it and took timely measures such as clinical treatment, epidemiological investigation, specimen collection and inspection, and medical observation of close contacts, and strengthened the monitoring of unexplained pneumonia cases.
The main manifestations of the three confirmed cases were typical viral pneumonia, with acute onset, high fever (above 38℃), cough and other respiratory infection symptoms in the early stage of the course. Dyspnea, severe pneumonia and progressive aggravation occur within 5-7 days after onset, and some cases can rapidly develop into acute respiratory distress syndrome and die.