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Saturday, November 14, 2020

Influenza Virus Notes

The outbreak of the swine origin influenza a virus s oiv h1n1 pandemic in 2009 has led to serious economic losses and public panic which illustrates the importance of flu prevention and. The species of orthomyxoviridae that can cause flu in pigs are influenza a virus and influenza c virus but not all genotypes of these two species infect pigs.

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Influenza virus is very contagious.

Influenza virus notes. Influenza virus is the causative agent of seasonal and occasionally pandemic flu. Prevention and control of seasonal influenza with vaccines. Influenza a virus particles are usually spherical and about 80 120 nm in diameter.

There are two main types of influenza flu virus. Influenza the flu is a respiratory infection. Only laboratory confirmed influenza cases are included.

Influenza a viruses can be broken down into sub types depending on the genes that make up the surface proteins. Provincial respiratory surveillance report influenza technical notes influenza cases. Influenza a virus n5 neuraminidase has an extended 150 cavity.

It is an enveloped virus and the envelope contains two glycoproteins hemagglutinin ha and neuraminidase na the membrane m2 protein and is internally lined by the matrix m1 protein. The most common symptoms include. Influenza a virus falls under the family orthomyxoviridae.

In 1997 h3n2 viruses from humans entered the pig population causing widespread disease among pigs. An envelope glycoprotein functions as hemagglutinin esterase and fusion protein. Detections of influenza nucleic acid detection culture isolation and enzyme immunoassay eia are reported from cadham provincial laboratory cpl and occasionally other laboratories.

Influenza c virus influenza c virus infects children but does not cause significant disease. Influenza commonly known as the flu is an infectious disease caused by an influenza virus. Most influenza cases occur during epidemics.

Types a and b. Influenza is a viral infection that attacks your respiratory system your nose throat and lungs. But sometimes influenza and its complications can be deadly.

Epidemics usually peak during the winter months. The influenza a and b viruses that routinely spread in people human influenza viruses are responsible for seasonal flu epidemics each year. Recommendations of the advisory committee on immunization practices united states 2020 2021 influenza season has been published.

It is caused by the influenza virus. The known subtypes of influenza a virus that create influenza and are endemic in pigs are h1n1 h1n2 h3n1 and h3n2. Influenza a virus share no antigens with influenza b virus.

Influenza typically is spread by air or by direct contact from one person to another. Symptoms can be mild to severe. Influenza b virus infects human only and causes similar but milder symptoms.

Influenza is commonly called the flu but it s not the same as stomach flu viruses that cause diarrhea and vomiting. High fever runny nose sore throat muscle and joint pain headache coughing and feeling tired. For most people the flu resolves on its own.

Cdc recommends annual influenza vaccination for everyone 6 months and older with any licensed age appropriate flu vaccine iiv riv4 or laiv4 with no preference expressed for any one.

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