Epidemiological survey of Trichinella infection in some areas of Henan province.

During 1996-1998 epidemiological survey of domestic Trichinella spiralis infection and serological survey on human beings were carried out in Yanling, Xuchang counties and Luohe city. By the artificial digestion method, the positive rates of pork in market and mutton were 1.6% and 0.6% respectively. Meat samples of pigs from pig-farms, cats and dogs were all negative for Trichinella larvae. Trichinellosis infection levels in rats captured in peasant households and places around abattoirs were 0.5% and 4.1% respectively (P < 0.05). By ELISA (double-antibody) with excretion-secretion (ES) antigens of Trichinella larvae, the positive rates of antibodies against Trichinella in sera of peasants and professional drivers were 2.2% and 7.8% (P < 0.05). The positive rates of antibodies in pigs from pig-farms and from peasant households were 1% and 7% respectively (P < 0.05). The levels of anti-Trichinella antibodies in rats captured in peasant households and places close to abattoirs were 0% and 11.1% respectively. Trichinella spiralis larvae were found in the washing meat slop in abattoirs.