Please ask for advice. What's wrong with my pig?

A few days ago, there was a litter of pigs weighing about 50 kilograms, with a high fever (about 41 degrees) and an overall decrease in feed intake. two days later, pigs in other nests in the same pig house showed the same symptoms. There are some diarrhea. Vomiting symptoms. May I ask the teachers what kind of disease this is? How to treat it? In a hurry. Is there any subcutaneous bleeding? Reproductive and Respiratory Syndrome tbz added the following at 14:31 on 2009-11-7, but only if classical swine fever was qualified-it should be the so-called anonymous high fever. High fever syndrome.