Swine flu under the microscope
Swine flu influenza is known to be caused by influenza A subtypes. In pigs H1N1 is one of the three most common strains of influenza A virus subtypes. Swine flu is transmitted from infected individuals through the air that are released by coughing, sneezing or talking from an already infected individual. Swine flu can also be transmitted by blood. The H1N1 virus particles range in size from 80-120 nanometres. The virus particles survive better in dry cold conditions. They can conserve their infectious capacity for one week at human body temperature, for 30 days at 0 °C and at lower temperatures for much longer.

Charlie Seyferr, H1N1- Swine flu and air filtration, 2009, Available: <http://www.greenairteknowledge.com/greenair/?p=96> (29 September 2009)

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Cris Perez