Human cases of H1N1 usually occur in people exposed to infected pigs.

Furthermore, an unusual case of zoonosis occurred when a swine flu inspector in improper gear caught the virus from an infected pig.

High levels of such antibody can prevent infection, and lower levels can minimize dissemination from infected pigs.

Vaccines have been found to reduce the severity of the disease but do not prevent the disease from occurring in infected pigs (Haesebrouck, et al., 2004).

Scientists determined that the virus was one that infected pigs and was different from the human influenza viruses circulating then.

Though the adult worms are never numerous, they are very fecund, and an infected pig may pass a million eggs per day.

During 1998, viral spread was aided by the transfer of infected pigs to other farms, where new outbreaks occurred.

Groups of infected pigs lie huddled together shivering, breathing abnormally and sometimes coughing.

In the case of chronically infected pigs, pleural adhesions and abscesses are normally found.

The 1st FMD infected pig was found and confirmed.