Strongyloidiasis is a parasitic nematode disease caused by The Lan's Roundworm parasitizes under the small intestinal mucosa of pigs. The disease mainly affects piglets aged 1 to 3 months.
Cause of onset
Roundworms of the Orchidoides parasitize only females in the small intestines of piglets. The female is milky white and has a small, hair-like body. Female insects in the small intestine of pigs camp parthenogenesis, the production of eggs containing larvae, eggs with feces excreted outside the body, generally after 12-18 hours to hatch out of the rod worm type larvae, in the summer of high temperature and high humidity generally need 6 to 8 hours to hatch the rod-shaped larvae. At this time, if the external environmental conditions are suitable, the rod worm type larvae develop into free-living adult worms, and the free-living female and male insects are transformed into filarial larvae, which can enter the piglet through the mouth or skin, drill into the blood vessels through the gastric mucosa, reach the lungs with the blood flow, and then reach the pharynx with the manganese fluid in the trachea, and finally enter the small intestine to develop into a female adult worm that reproduces as a parthenogenesis. Parasitic females can survive continuously in the host for 6 to 9 months.
Clinical manifestations
At the beginning of the disease, the surface of the piglet is reddened by the physical stimulation of the larvae, and the skin has eczema, and the inside of the legs, under the femur, the back, and the two ribs have red protruding rashes. Later eruptions, swelling, rough skin surface, dull coat, dry skin, wrinkled bleeding and suppuration; when the larva migrates to the lungs, coughing, wheezing, dyspnea, elevated body temperature, some canine sitting breathing, some abdominal breathing; when there is a large number of insect parasitism in the small intestine, the small intestine is congested, bleeding and ulceration occurs, followed by gastrointestinal symptoms, sick pigs are emaciated, anemia, abdominal pain, diarrhea, feces with blood or mucus. In the end, many people die of exhaustion.
Autopsy changes
The main manifestations are pericarditis, endocardial hemorrhage, hepatitis, hemorrhagic infarction of the spleen, renal hemorrhage, pyelonephritis, cystitis, intestinal mucosal hyperemia, large colon, erosive ulcer on the surface of the cecum, and fine parasitic females in the intestinal lumen.
Prevention and control methods
1. Strengthen feeding management, timely clean up the feces of the pen, use phenol, the enemy insects to the diseased pig body and the pen are fully sprayed, and the ground is used to absorb moisture and sterilize quicklime.
2. Ivermectin is 0.2 to 0.3 mg per kilogram of body weight, subcutaneous injection or levamisole is 10 mg per kilogram of body weight, soluble in water irrigation or mixing feeding.
3. Piglets with severe diarrhea are injected with 20mL of glucose or intraperitoneally injected 500mL of glucose saline.