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Bovine rotavirus disease is an acute gastrointestinal infectious disease caused by a variety of young animals and infants caused by rotavirus. It is characterized by mental anxiety, anorexia, vomiting, diarrhea, and dehydration.

Bovine rotavirus disease

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Bovine rotavirus disease is an acute gastrointestinal infectious disease caused by a variety of young animals and infants caused by rotavirus. It is characterized by mental anxiety, anorexia, vomiting, diarrhea, and dehydration.

Chinese name

Bovine rotavirus disease

Pathogen

Rotavirus

Susceptible body

Calf

Age of onset

15 90 days

The pathogen of this disease is rotavirus, the virus particles are round and wheel-like. The virus is more resistant to external factors and remains infectious in feces and antibody-free milk for six months. Feces of patients and cryptic infections contain a large amount of rotavirus and can be transmitted to susceptible humans and animals through the digestive tract. There is a certain cross-infection effect between humans and various animals. As long as the virus persists in humans or an animal, it may cause the disease to spread in nature for a long time.

The disease mainly occurs in calves, and the age of onset is mainly 15 to 90 days. More incidence in spring and autumn. The virus is present in the intestine, is excreted with feces, and infects the digestive tract. Rotavirus has the effect of cross-infection, and can be transmitted from human or one animal to another. As long as the virus persists in human or one animal, it may cause the disease to spread in nature for a long time. In addition, the disease may be transmitted to the fetus through the placenta.

The incubation period is 18 to 96 hours, which mostly occurs in calves of 15 to 90 days of age. The sick calf is depressed, with less milk, and body temperature is normal or slightly higher. Diarrhea stools are white or off-white, some are yellow-brown, and the stools are thick or watery. Sometimes they have intestinal mucosa and contain undigested curds, and the frequency of defecation varies. In general, the mortality rate does not exceed 10%, but if there is a secondary infection, especially in severe weather, and the sick calf is infected with pneumonia, the mortality rate will be greatly increased.

Post-mortem examination shows that the virus mainly invades the small intestine, especially the jejunum and ileum, showing that the intestinal wall becomes thin, the contents are liquid, and the intestinal villi atrophy.

The disease occurs in the cold season, and it often affects animals. Sudden occurrence of watery diarrhea. The incidence is high and the mortality is generally low. The main lesion is the small intestine of the digestive tract. Based on these characteristics, a preliminary diagnosis can be made. However, attention should be paid to differences from calf colibacillosis and epidemic diarrhea. Confirmation requires laboratory diagnosis.

Pay attention to the cold protection and warmth of the cowshed; the bovine rotavirus attenuated vaccine, which is still in the experimental stage, is used to immunize cows and protect calves with colostrum antibodies, which has a certain effect; rotavirus live poison can also be applied to calf diarrhea The vaccine is administered orally. This oral vaccine is protective against artificially infected calves and reduces the natural incidence.

Sick cattle should be isolated immediately in a clean, dry and warm stable. When starting treatment, stop breastfeeding and avoid breastfeeding. Instead, use a glucose glycine solution (glucose 43.2g, sodium chloride 19.2g, glycine 6.6g, citric acid 0.52g, potassium citrate 0.13 g, anhydrous potassium phosphate 4.35 g, dissolved in 2 liters of water) or glucose amino acid solution for sick animals to drink freely, or intravenous injection of glucose saline and sodium bicarbonate solution to prevent dehydration and desalination and cause poisoning And shock. Antibiotics should be used for secondary bacterial infections.