Streptococcus suis is caused by several major streptococcus, often manifested as acute sepsis in pigs, encephalitis, focal lymph node purulence, chronic arthritis and endocarditis. The piglets are mainly acute sepsis and encephalitis, and some lymph nodes are purulent.
ã€Pathogens and epidemic characteristics】
Streptococcus is Gram-positive. The bacteria are not resistant to the external environment and are sensitive to dryness and high temperature. Changchuan's disinfectant can kill it quickly. For various antibiotics such as penicillin, streptomycin, gentamicin and sulfonamides. Sensitive, but susceptible to drug resistance, must be used interchangeably.
Pig streptococcosis mainly occurs in nursery pigs after weaning, with acute onset and high mortality. Infected by wounds in the respiratory tract and skin, piglets can also be infected with the umbilical cord. It can happen all year round, but it happens more from May to November.
〠Symptoms】
Acute septic type: The piglet suddenly occurs, the body temperature rises to 41 - 42 °C, the systemic symptoms are obvious, the spirit is depressed, the appetite is diminished or not eating, the conjunctival flushing, tearing, nasal flow, constipation; some sick pigs have arthritis, limp or Can not stand; some sick pigs have ataxia, molars, empty chewing, lethargy and other neurological symptoms, late breathing difficulties, 1 to 4 days of death.
Meningoencephalitis type: more common in suckling piglets and weaned piglets, in addition to systemic symptoms such as elevated body temperature, no food, and soon showed neurological symptoms, limb ataxia, circling, molars, supine, hind limb paralysis, crawling, part Arthritis occurs in sick pigs. 1 - 5 days of death.
In addition to the above, there are arthritis type, lymph node abscess type and the like.
ã€Pathological changes】
Acute septic type: mainly hemorrhagic lesions and serosal inflammation, the skin of the sick pig has purple spots, submucosal and mucosal subcutaneous hemorrhage. Serous effusion, containing fibers and the like. Nasal mucosa is purple, congested, and bleeding. The throat and trachea are congested, and some people are the most foamy. The lungs are swollen and swollen. Systemic lymph nodes have varying degrees of swelling, congestion, and bleeding. Pericardial effusion is pale yellow, a small number of visible cellulosic pericarditis. Mild cellulosic pleurisy can be seen in the course of the disease. There is a small amount of pale yellow effusion in the abdominal cavity, and some have mild fibrinous peritonitis. In most cases, the splenomegaly is dark red or purple-blue, soft and brittle. Most of the kidneys have mild swelling, congestion and bleeding. The meninges have different degrees of congestion or hemorrhage, some subdural edema, and effusion.
ã€Control methods】
1 Do a good job in the pig house and the environment, pay attention to the wound treatment, and apply the sulphur ointment. 2 In the frequently-occupied farms, a streptococci attenuated vaccine (freeze-dried vaccine) can be injected. Each pig is injected with 200 million live bacteria, and the piglets are injected once every 35-45 days after birth. This seedling is made of Streptococcus aureus type C and prevents streptococci from piglets. Immunization occurred 7 days after injection for 6 months. 3 The sick pig should be isolated and treated immediately, and the pig house should be disinfected. 4 Piglets can be used in the early stage of the onset of penicillin, 10,000 to 20,000 units per kilogram of body weight, streptomycin per kilogram of body weight with 12,000 units: 10% sulfamethazine, 5-10 ml per piglet; sulfonamide Methyl sputum plus antibacterial synergist. However, streptococcus is susceptible to drug resistance, and multiple antibacterial agents must alternate.
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