1. Transmission route: Classical swine fever is mainly transmitted by contact, infected by digestive tract and respiratory tract, and can also infect fetus vertically through placenta. 2. Source of infection: The source of infection is mainly sick pigs. In addition, the excrement and secretions of sick pigs, the viscera and corpses of sick pigs, and feed and drinking water contaminated by blood, meat and viscera of sick pigs can also spread the virus. 3. Symptoms: elevated body temperature, loss or disappearance of appetite, purulent secretions from nasal cavity and conjunctiva, and needle-like bleeding spots on the body.

1. What is the route of transmission of classical swine fever?

1, transmission route

(1) Classical swine fever is mainly transmitted by contact, infected by digestive tract and respiratory tract, and can also infect fetus vertically through placenta.

(2) Direct contact with secretions, excreta, semen and blood of sick pigs.

(3) Eating feed and drinking water contaminated by virus.

(4) Feed the pigs directly with raw swill.

(5) Actively communicate through the trade of farm visitors, veterinarians and pigs.

(6) Indirect transmission by outsiders, vehicles and needles.

2, the source of infection

(1) The main source of infection is sick pigs.

(2) In addition, the virus can also spread through the excreta and secretions of sick pigs, viscera and corpses of sick pigs, blood, meat, viscera, waste water, feed contaminated by waste materials and drinking water of sick pigs.

Second, what are the symptoms of swine fever?

1, the most acute type

The most acute type is rare. Sick pigs generally have no other symptoms except elevated body temperature, and die suddenly in about 1-2 days.

2. Urgent type

Acute type is the most common, mainly manifested as the temperature rising above 465438 0℃, the desire to eat decreased or stopped eating, and purulent secretion from nasal cavity and conjunctiva. Some sick pigs have vomiting, early constipation, dry and hard feces with white mucus, late diarrhea, and foul feces with mucus or blood. Needle-shaped bleeding spots appear on the skin of the alar, the root behind the ear, the abdomen, the inner skin of limbs, gums, lips and anal mucosa, which do not fade after extrusion.

3. Chronic type

Thin body, loss of appetite, high and low body temperature, alternating constipation and diarrhea, rough fur, weakness of hind legs and unstable walking. The ear tips, tail ends and lower limbs of some sick pigs turned blue-purple or necrotic.

4. Mild type (atypical)

Common in weaned piglets and shelf pigs, the symptoms are not obvious, mainly manifested as body temperature staying at 40℃, appetite ebbing and flowing, dry feces, skin congestion and necrosis, and emaciation.