1. Clinical symptoms: the sick pig's body temperature rises and its spirit is low. He is often undercover, unwilling to walk and having difficulty breathing. Some sick pigs have purple spots on their ears, nose and feet, and a few sick pigs will have unstable standing, bloody stool and convulsions on the ground.

2, autopsy symptoms: African swine fever pigs, dissected after death, it has a very typical symptom, that is, spleen enlargement, dark red color. Combined with clinical symptoms, if there is such a symptom, the sick pig is likely to be infected with non-plague

3. Laboratory diagnosis: If it is necessary to make a diagnosis, it is necessary to carry out laboratory diagnosis and sample the sick pigs. If infected, African swine fever virus can be detected.

Extended data:

African swine fever prevention and control measures are as follows

1, strengthen environmental management. Ensure that the pigsty is hygienic, the temperature is appropriate and the ventilation is good. Pig feed, drinking water and utensils should be changed and cleaned every day. Disinfect the environment around the pig farm regularly, and regularly check whether the water source is polluted. Pig manure should be cleaned up in time and not accumulated for a long time.

2. Eliminate mosquitoes and flies. Mosquitoes and flies, mice and insects are the transmission routes of the disease, so we should pay attention to prevention, eliminate mosquitoes and flies and prevent them from being in pig houses.

3. Strengthen disinfection. Whether it is a pig house, pig utensils or foreign vehicles, a strict disinfection system should be implemented.

4. Closed management. Idle people are prohibited from entering the pigsty to contact with pigs. Piglets or breeding pigs should know in advance and do a good job of testing to avoid bringing viruses into pigs.

It is forbidden to feed pigs with swill. It is forbidden to feed pigs with kitchen leftovers, and resolutely do not feed pigs with swill.

6. Once African swine fever occurs, it should be reported to the local authorities in time and emergency scientific treatment measures should be taken. Dead pigs should be treated harmlessly. Pig farms should be completely disinfected, and pigs should not be raised temporarily in the short term, and then cultured after a while.