wowpow32, almost always, the meat or pork you see being steamed has been previously cooked; the steaming is used to re-heat the previously cooked food that may have cooled or been refrigerated or frozen. If an animal becomes infected and its meat is then eaten raw or undercooked, the parasite is passed to the human or animal that consumes the meat.
It is estimated that 1.5 million people in the U.S. become infected with Toxoplasma gondii each year. Most individuals do not experience recognizable symptoms, and will develop a protective resistance to the parasite. Toxoplasmosis most often results from eating raw or undercooked meat, eating unwashed fruits and vegetables, cleaning a cat litter box or handling contaminated soil.