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Mode of Transmission

There are basically two modes of transmission of swine flu to humans:
From Pigs to Humans
It is the most common mode of swine flu transmission to humans. Those who work closely with the animals especially those who work with poultry or swine and the veterinarians are most exposed to the virus.

From humans to Humans
It is not the common mode of transmission of swine flu, although it is expected to be a reason of the extensive spread of this virus in humans, as the virus is also seen in people who had no direct interaction with the pigs.The virus gets into the air when an infected person sneezes or coughs and the droplets with the virus come in direct contact with another person’s eyes, nose or mouth.

Some Modes of Transmission are as below:

  • Influenza viruses can be directly transmitted from pigs to people and from people to pigs.
  • Human infection with flu viruses from pigs are most likely to occur when people are in close proximity to infected pigs, such as in pig barns and livestock exhibits housing pigs at fairs.
  • Human-to-human transmission of swine flu can also occur. This is thought to occur in the same way as seasonal flu which is mainly person-to-person transmission through coughing or sneezing by people infected with the influenza virus.

  • Disease spreads very quickly among the population especially in crowded places.
  • Cold and dry weather enables the virus to survive longer outside the body than in other conditions and, as a consequence, seasonal epidemics in temperate areas appear in winter.
  • People may become infected by touching/handling something contaminated with flu viruses on it and then touching their mouth or nose.
  • Swine influenza viruses are not transmitted by food.
  • Eating properly handled and cooked pork (at an internal temperature of =160°F) and pork products is safe.