Which diseases cause high fever in pigs without purple patches on the skin?

1. Japanese encephalitis: The body temperature of affected pigs is 40-41°C, with teeth grinding, circling, visual impairment, and blind charging. Sows abort, and boars develop orchitis, which gradually atrophies and hardens, causing loss of breeding ability. For treatment and drug prevention, antiviral preparations such as amantadine and ribavirin combined with interferon, along with traditional Chinese medicine preparations for clearing heat and detoxifying, and antipyretic-analgesic preparations, should be used together, which has a certain therapeutic effect.

2. Pseudorabies: It mostly occurs in piglets aged 1-4 weeks, and piglets over 60 days of age show mild symptoms. Body temperature is 41-42°C. In the early stage of the disease, the pigs are restless and excitable, with trembling, constant forward charging or circling, and hoarse squealing; in the later stage, convulsions, paralysis of the limbs, lying on the back, and swimming motions of the limbs occur. Pregnant sows abort. Necropsy shows congestion and edema of the meninges and increased cerebrospinal fluid. For treatment, injection of antiviral preparations combined with interferon, etc., has a certain therapeutic effect.

3. Heatstroke: It mostly occurs in pig farms with high temperature, high humidity, insufficient drinking water, and relatively poor feeding management. The body temperature of affected pigs is above 42°C, with rapid breathing, mucosal redness or purpleness, accelerated heartbeat, and extreme restlessness. Moving the affected pigs to a cool place and increasing drinking water can lead to gradual recovery.

4. Toxoplasmosis: It mostly occurs in pigs aged 3-4 months, with body temperature above 41°C, difficulty breathing, and abortion in pregnant sows. Pulmonary interstitial edema; enlarged lymph nodes, with watery transudate on the cut surface and necrotic lesions. For treatment and drug prevention, sulfonamide antibiotics are effective.

Prevention and control measures

(1) During the epidemic season of swine influenza or in the early stage of an outbreak on a pig farm, administer traditional Chinese medicine preparations for clearing heat and detoxifying to the whole herd, such as Qingwen Baidu San, Da Qing Re, Bing Du Qing, etc., for 3-5 consecutive days, which has a relatively significant preventive effect.

(2) During the epidemic season of swine influenza, pig farms should carry out a comprehensive disinfection once a week and disinfect the pig houses once every 2 days, strictly implement the farm's sanitation and epidemic prevention system, and prevent introduction of the disease.

(3) For the treatment of affected pigs, compound preparations containing antiviral agents with antipyretic and analgesic effects (such as Re Du Te Hao) should be selected, combined with traditional Chinese medicine preparations for clearing heat and detoxifying (such as Wen Du Li Ke), which has a relatively significant therapeutic effect, used for 2 consecutive days. After body temperature returns to normal, appetite-promoting and stomach-strengthening, intestine-clearing treatments should be given in a timely manner, with supplementary treatments such as electrolyte multivitamins and oral rehydration salts, resulting in a relatively high cure rate.