Control of swine eubacillosis

Porcine true bacilli (formerly known as Corynebacterium suis) are widely distributed in nature, most of them are non-pathogenic bacteria, only a few are pathogenic and can cause acute or chronic infectious diseases of human and livestock. It is generally characterized by suppurative or caseous pathological changes in some tissues and organs. Clinically, it mainly causes urinary system infection in sows.

Pathogen and epidemic characteristics Porcine true bacillus is a pleomorphic bacilli. From globular to rod-shaped, the longer bacteria were dilated at one or both ends in the shape of a rod, either in a grid or in clusters. Gram staining was positive and no flagella, capsule and spores were found. The bacteria mainly exist in the prepuce and prepuce diverticulum of healthy boars. About 80% of healthy pigs carry bacteria normally, and a small amount can also be found in the vestibule of the vagina of sows. If the urethral orifice of sows is damaged during mating, the bacteria can retrograde through the urethra to the bladder to grow and reproduce, causing cystitis and pyelonephritis.

Clinical symptoms of mild disease pigs, only the vulva has purulent secretion, excretion of a small amount of hematuria. Seriously ill pigs, pathological changes can affect the urethra, bladder, ureter, renal pelvis and kidney, frequent micturition, urine containing pus cells, blood clots, cellulose and mucous membrane fragments, loss of appetite or do not eat, depressed spirit, thirst, gradually emaciated. Some also cause suppurative pneumonia, bronchitis, endometritis, polyarthritis, osteomyelitis, piglet omphalitis, subcutaneous abscess and breast abscess in pigs.

The prevention and treatment measures found that the diseased pigs were isolated and treated in time, with a large dose of penicillin, 40 000 units / kg body weight, twice a day for 3 consecutive days, followed by enrofloxacin and 7mg/ kg body weight for 3 consecutive days. In order to prevent the disease, boars with suspected strains were given disinfectant solution such as 0.1% potassium permanganate to rinse the prepuce and prepuce diverticulum, and conditionally promote pig artificial insemination. For the sows with vaginal injury, it has a better preventive effect by intramuscular injection of penicillin for 3 days after mating.