Prevention and treatment of sheep streptococcosis

Sheep streptococcosis is an epidemic disease that seriously harms goats and sheep. it is an acute febrile infectious disease caused by hemolytic streptococci, which occurs in the cold season of winter and spring (from November to April of the following year), and is mainly transmitted through digestive tract and suction canal. Its clinical features are mainly swelling of mandibular lymph nodes and throat. Sheep are the most vulnerable, and goats are also easy to be infected. most of them are endemic in winter and spring, and the old epidemic areas are generally sporadic, characterized by fever, swelling of the jaw and throat, gallbladder enlargement and fibrinous pneumonia.

Symptoms of sheep streptococcosis

At the beginning of sheep disease, loss of energy, loss of appetite or lack of food, cessation of rumination, unstable walking, conjunctival congestion, tears, post-purulent secretion, nasal serous rhinorrhea, later become purulent, salivation, body temperature rose to more than 41 ℃, swollen throat and tongue, loose feces, with mucus or blood, pregnant ewes aborted, some sick sheep eyelids, lips, cheeks, breast swelling, moaning, grinding teeth, convulsions. The acute case had dyspnea and died within 24 hours. Normally, he dies within 2 to 3 days.

Diagnosis of sheep streptococcosis

According to the changes of clinical symptoms and autopsy, combined with epidemiology, the preliminary diagnosis can be made. Laboratory examination can be carried out for diagnosis, and microscopic examination shows that most of the bacteria are double spherical, chain-shaped or single, surrounded by a capsule and positive for Gram staining. Smears of liver, kidney and lung tissues of dead sheep and microscopic examination of Gram staining showed that Gram-positive cocci were double-spherical and capsular, occasionally with 4-6 short chains, and occasional single cocci. There is a capsule around it and Gram's staining is positive. When the diseased materials were aseptically inoculated on blood Agar plates for 24 hours, there were small, gray-white, glossy, transparent, moist and sticky colonies, and there was obvious β-type hemolytic area around the colonies. Most of the long-chain Gram-positive cocci could be seen. Rabbits were injected subcutaneously or intravenously with the culture of Martin broth for 24 hours and died for more than 24 to 28 hours, and bacteria could be isolated from their heart blood and organs.

Prevention and treatment of sheep streptococcosis

1. Improve grazing management conditions, keep warm and prevent wind, prevent freezing, prevent crowding, prevent the introduction of disease sources.

2. Regularly eliminate parasites in and out of sheep.

3. Do a good job in disinfecting sheep pens, venues and appliances. Before the beginning of winter, the sheep were injected with streptococcal aluminum hydroxide formaldehyde vaccine. All the sheep were injected subcutaneously with 3 milliliters, and the lambs of 3 months old were immunized again 14 days later.

4. After the onset of the disease, the sick sheep and suspected sheep should be isolated and treated respectively, the sites and utensils should be strictly disinfected with 10% lime milk or 3% Lysu, sheep dung and dirt should be accumulated and fermented, and sick and dead sheep should be treated innocuously.

5. Each diseased sheep was injected with penicillin 30 ~ 600000 international units intramuscularly, once a day for 3 days. 10 ml of sulfathiazole was injected intramuscularly once a day for 3 days. It can also be taken with sulfadiazine or chlorobenzenesulfonamide 4-8 grams, twice a day for 3 days.

6. Patients with high fever were injected intramuscularly with nearly 3 milliliters of analgesone, and those with severe loss of appetite were given cardiotonic rehydration, 500 milliliters of 5% glucose saline, 5 milliliters of sodium caffeine, 5 milliliters of vitamin C, and 10 milliliters of dexamethasone intravenously, twice a day for 3 days.

7. Strengthen feeding and management, do a good job of catching fat, keeping fat, keeping warm and windproof, anti-freezing and anti-crowding. Regularly eliminate parasites in and out of sheep. Do a good job in the disinfection of sheep pens, venues and appliances. Streptococcal aluminum hydroxide formaldehyde vaccine was injected before winter. All the sheep, big or small, were injected subcutaneously with 3 milliliters, and the lambs of 3 months old were immunized again after 14 days. It is effective to inject antibiotics such as anti-streptococcus serum or penicillin into each healthy sheep in the epidemic area.