Swine flu (H1N1) is the newest virus that had been discovered not even a month. It first discovered in mexico and more than 200 mexican had been died, an un-estimated number of mexican had been infected and many reports had shown that swine flu spears out in societies.
Scientists studied the pathology of the virus, they found that all infected animals showed flu-like symptoms between one and four days after infection and were shedding virus two days after infection. The Chulalongkom universityhad done a research and they came out with following result, who infected 22-days old pigs with both the H1N1 strain of swine flu and the less dangerous H3N2 subtype. There are symptoms of infections of developing respiratory system such as nasal discharge and coughing. 
Lung lesions may also be large eough to observe by eyes. The lesions were characterized by dark plum-coloured, consolidated areas on lung lobes and severed two days after infection, a third of the lung was covered in the H1N1-infected pigs.
article resource:
http://www.sciencedaily.com/releases/2009/05/090511091905.htm
http://www.sciencedaily.com/releases/2009/05/090511091905.htm
