How To Transmission?

Transmission between pigs

The main route of transmission is through direct contact between infected and uninfected animals. These close contacts are particularly common during animal transport. The direct transfer of the virus probably occurs either by pigs touching noses, or through dried mucus. Airborne transmission through the aerosols produced by pigs coughing or sneezing are also an important means of infection. The virus usually spreads quickly through a herd, infecting all the pigs within just a few days. Transmission may also occur through wild animals, such wild boar, which can spread the disease between farms.

Transmission to humans

People who work with poultry and swine, especially people with intense exposures, are at increased risk of zoonotic infection with influenza virus endemic in these animals, and constitute a population of human hosts in which zoonosis and reassortment can co-occur. Transmission of influenza from swine to humans who work with swine was documented in a small surveillance study performed in 2004 at the University of Iowa. This study among others forms the basis of a recommendation that people whose jobs involve handling poultry and swine be the focus of increased public health surveillance.

Transmission to humans usually does not result in influenza in humans. When it does result in influenza, usually the influenza is mild and the basic reproduction number of the virus in human hosts is low enough that an outbreak does not occur.

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1 comment so far

  1. Roslyn Gosnell on

    The symptoms of this flu are not widely advertised. There is a lot of talk about “Swine Flu”, but how is it different from the “common cold” There is supposedly a new strain of flu with every year that passes, yet noone seems to be able to give an acceptable answer to why or how to control it. The “World Authorities” appear to be overreacting. Are they simply trying to control the masses.


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