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

2.   Infected pigs have been known to squeal in agony while walking on their knees.

3.   Any hog farm found with even one infected pig must destroy its entire stock.

4.   But subsequent tests found a different virus, called the Hendra, which is spread by contamination and contact with infected pigs.

5.   Deputy director-general of Health Abdul Aziz Mahmood warned that a new strain of the virus is believed to be transmitted through direct contact with infected pigs.

6.   Government health officials, believing that there are still some infected pigs, have been conducting random tests in Perak state.

7.   Health officials have been monitoring a rise in cases of the virus, which is believed to be passed to people by mosquitoes that have bitten infected pigs.

8.   Health officials have been monitoring a rise in cases of Japanese encephalitis, which is believed to be passed to people by Culex mosquitoes that have bitten infected pigs.

9.   Health officials have been monitoring a rise in cases of Japanese encephalitis, which is believed to be passed to people by mosquitoes that have bitten infected pigs.

10.   Japanese encephalitis is believed to be spread to humans from infected pigs through the bite of the Culex mosquito.