How should repeated fever in pigs be prevented and treated?

Pigs suffering from "high fever syndrome" generally show persistent high fever (around 41.5°C), reddened skin with bleeding spots, cyanosis of the ear tips, congestion of the conjunctiva, labored breathing or coughing, reduced appetite, and abortion in some sows; necropsy reveals brown lesions of varying size in the lungs, and in severe cases the lesions involve the entire lung, while the kidneys appear earth-yellow (similar to the color of the kidneys in swine fever), and the lymph nodes are swollen, hemorrhagic, and juicy on the cut surface.

The key to preventing and treating this disease is to adopt a prevention-first policy. First, carry out measures such as isolation, disinfection, and quarantine to prevent the introduction of the disease. After diseased pigs are found, first, for pig farms where high fever syndrome has occurred and the PRRS test is positive, pigs must promptly be injected with attenuated PRRS vaccine; for farms and households where pigs have not had PRRS but face a relatively high threat from PRRS, pigs should be injected with inactivated vaccine; the fluctuation of this disease in some areas is related to the discontinuation of PRRS vaccine; second, prevention of atypical swine fever must be strengthened, because in cases of "high fever syndrome," swine fever is an important cause of high mortality, so the effectiveness of swine fever immunization must be ensured; third, select effective antibiotics to control secondary infection, and antibiotics can be chosen through drug sensitivity testing; fourth, according to the different pathogens involved (such as mycoplasma, toxoplasma, Eperythrozoon suis, etc.), select symptomatic drugs for preventive medication or treatment to reduce the losses caused by the disease; fifth, use some drugs that can increase the immunity of pigs for preventive medication or treatment, which has a certain effect; sixth, cull recovered breeding pigs in a timely manner, because generally recovered breeding boars mated with sows often lead to low litter size and a high abortion rate, and their value for use is affected.