Influenza Virus seasonal , pandemic and zoonotic

Influenza Virus seasonal , pandemic and zoonotic


People worldwide are mixing between different kinds of influenza either seasonal, pandemic or zoonotic Influenza we will try in this article to differentiate between the Influenza Virus seasonal , pandemic and zoonotic

Influenza Virus types seasonal , pandemic and zoonotic

Influenza Virus types seasonal , pandemic and zoonotic


Seasonal influenza 

Causing human influenza annually mainly in temperate climates during cold months (winter) spreading via sneezing , coughing or even touching contaminated objects can transmit the influenza virus leading to disease that can be mild or severe infections that can lead to death of some vulnerable persons e.g. extreme age group , pregnant mother persons with chronic diseases , immunocompromised persons.


Influenza virus is evolving continuously and people can be infected by influenza many times during they lives, so the vaccine is updated annually for the Best Guess on annual basis to ensure best match for the seasonal strain to achieve effectiveness of the vaccine


Seasonal influenza are three types (A, B, C)  the most aggressive type is A followed by B and the most benign one is Influenza C


Type A Influenza:

Are divided into subtypes based on a unique protein combination occur in the virus surface H Hemagglutinin and N neuraminidase common types are Influenza A (H3N2) Influenza A(H1N1), A(H7N9)


Type B Influenza:

Circulating as influenza A causing fewer infections and outbreaks and are named after the areas where they were first identified, Yamagata lineage and Victoria lineage.


Type C Influenza:

Cause mild infections and mainly are not provided as a seasonal influenza vaccine



Starting from 2013 the WHO claimed that Influenza A(H1N1) virus which causing pandemics in 2009 is no more pandemic and now is classified under the regular seasonal influenza




Pandemic influenza


When Influenza virus circulating new strain due to either antigenic drift or antigenic shift a newly identified influenza virus invades the immune system of people with people has no immunity against it and cause severe infection transmitted very fast e.g. Influenza A(H1N1) during 2009 . Some pandemics e.g. Spanish Flu during 1918-1919 causing pandemics leading to 20-40 million deaths


Zoonotic or variant influenza


People can get influenza infections from animals e.g. swine influenza  A(H1N1) and (H3N2) also avian influenza virus A(H5N1) and A(H9N2)


Be aware that these animal viruses are entirely different from human influenza viruses and do not spread smoothly in between people. Some of those viruses may occasionally infect people, though, it may cause disease varying from mild conjunctivitis to severe pneumonia and even death.


It is advised to get Influenza vaccination annually (Get the Shot Instead of Getting the Flu)


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