Diagnostic measures of common infectious pig diseases

In late spring and early summer, the seasons change, the climate is changeable, all kinds of epidemic diseases are high, and pigs are easy to be infected with epidemic diseases.

In pig production, we often encounter pig diseases with typical digestive tract symptoms such as the following dysentery, which are caused by viral diseases, bacterial diseases and parasitic diseases, all of which have symptoms of dysentery. It is easy to cause misdiagnosis, so scientific identification and timely diagnosis is particularly important.

Yellow dysentery of piglets

Yellow dysentery of piglets is an acute, fatal disease caused by pathogenic E. coli. Diarrhea of sick pigs, discharge of yellow pulp dung, containing small pieces of curd, soon emaciated, coma and died. The gastrointestinal tract is dilated with a large amount of yellow liquid contents and gases, the intestinal mucosa shows acute catarrhal inflammation, and the small intestinal wall becomes thinner. It is most likely to occur in 1-3-day-old piglets, and some piglets develop the disease at 12 hours after birth, with high morbidity and mortality.

White dysentery of piglets

White dysentery of piglets is an acute intestinal infectious disease caused by pathogenic Escherichia coli. the feces of diseased pigs are milky white or gray, pulpy or paste, fishy and sticky, and the intestinal mucosa has catarrhal inflammatory lesions. Most of them occurred in 10-30-day-old piglets with moderate morbidity and low mortality.

Piglet red dysentery

Red dysentery of piglets is a highly fatal enterotoxemia caused by Clostridium perfringens type C. bloody dysentery, short course of disease, high mortality, diffuse bleeding or necrotic changes in the posterior segment of the small intestine. The diseased pigs excreted blood samples with dilute feces containing fragments of necrotic tissue. The jejunum is dark red, the mesenteric lymph nodes are bright red, there is small bleeding at the edge of the spleen, and the kidney is grayish white. It mainly affected 1-3-day-old piglets. Piglets over 1 week old seldom developed the disease, with high morbidity and low mortality.

Swine dysentery

An intestinal infectious disease caused by pathogenic porcine dysentery, serpent spirochete, catarrhal hemorrhagic inflammation, cellulosic necrotizing inflammation, mucous or mucous hemorrhagic dysentery in the large intestinal mucosa of sick pigs. The diseased pig's appetite decreases, the feces become soft, with strips of mucus on the surface, and then the feces are yellow, soft or watery, until the feces are filled with blood and mucus. The mucous membrane of the large intestine is swollen and covered with mucus and cellulose with blood clots. the content is soft to thin and mixed with mucus, blood and tissue fragments. Pigs of all ages and breeds were susceptible, but piglets at the age of 7 to 12 weeks were more likely to occur. The epidemic of the disease is non-seasonal and lasts for a long time.

Porcine transmissible gastroenteritis

Transmissible gastroenteritis is a highly contacting intestinal disease caused by porcine transmissible gastroenteritis virus (coronavirus), causing vomiting, severe diarrhea, and dehydration in diseased pigs. Piglet feces are yellow, green or white and may contain undigested curd blocks. Adult pigs have vomiting and gray-brown watery diarrhea. Gastric fundus mucosal congestion, bleeding, mesenteric congestion, lymph node swelling, intestinal wall thinning and translucent. The case fatality rate of piglets within 10 days old was high, the mortality rate of pigs over 5 weeks old was low, and adult pigs almost did not die. It usually occurs in winter and spring, and the peak of incidence is from January to February.

Porcine epidemic diarrhea

An acute contagious intestinal infectious disease caused by porcine epidemic diarrhea virus (coronavirus), vomiting, diarrhea, and dehydration in diseased pigs. Sick pigs have watery diarrhea, severe dehydration, depression and loss of appetite. The small intestine was dilated, filled with yellow fluid, mesenteric congestion, mesenteric lymph node edema, and small intestinal villi shortened. Pigs of all ages are infected, and the incidence of suckling piglets, shelf pigs or fattening pigs is high. The disease mostly occurs in the cold season, especially in December and January of the following year.

Piglet paratyphoid fever

Paratyphoid fever of piglets is a disease caused by salmonella, with clinical symptoms such as septicemia, enteritis and abortion in pregnant females. The skin of the ear root, chest, lower abdomen and posterior body of the diseased pig was purplish red, and the feces were foul yellow or yellowish green, mixed with blood, necrotic tissue or cellulose floc. Splenomegaly, hard texture, dark purplish red, systemic lymph node congestion, swelling, mesenteric lymph node enlargement is cord-shaped. It often occurs in piglets under 6 months old, especially in 1-4 months old. The disease can occur all the year round, and it occurs more frequently in rainy and humid seasons.