The World Health Organisation (WHO) on Saturday declared the swine flu outbreaks in Mexico and the United States "a public health emergency of international concern".
Asia on alert
Malaysia on alert
Here's the CDC full guidelines.
Otherwise prevention is just like how you prevent a flu:
basically go far and wide whenever you hear a sneeze. Close your mouth with hanky when sneezing. regular handwash and avoid American and Mexican, for the time being.
The virus appears to infect by human-to-human transmission. Investigations of infected patients indicate no direct contact with swine, such as at a farm or agricultural fair. In contrast, for example, disease transmission in the last severe human outbreak of influenza, the bird flu that peaked in 2006, was determined to be entirely or almost entirely from direct contact between humans and birds.
anyway, just be careful when taking pork.