关键词: 及虫, 藐小棘隙吸虫, 人体感染, 形态学

Abstract: Human natural infection with Echinochasmus Hliputanus was found for the first time from the inhabitants of Hexim county of Anhui Province in Spring,1991.Sixty worms collected from 3 infected rersons were studied morphologically.The adult worms are leaf-sh-aped,1519.4-2056.3×466.4-564.0μm in size.The width of the collar is 235.8-297.3μm.A row of 24 collar spines with size of 22.5-35.6×8.8-10.6 Mm is arranged on the collar symmetrically with dorsal and ventral interruption.The oral sucker is terminal,107.6-148.6×102.5-148.6μm.The length of the prepharynx is 25.6-66.7μm,the pharynx,97.3-127.8 Mm and the oesophagus 117.9-205.0 Mm.The caeca 764.3-1 248.8×21.0-39.0μm extends to the distal end of the body.The acetabulum is anterior to the middle level of the body,205.0-240.9×205.0-235.8μm in size.Two testes,situated in the posterior one third of the body,is slightly oval,in tandem; the anterior one is 133.3-199.9×199.9-256.4μm in size,and the posterior one,178.9-251.3×164.0-246.0μm.The Cirrus pouch is kidney-shaped,211.5-248.5×112.8-194.8μm in size,located between the bifurcation of the intestine and the ecetabulum,containing the seminal vesicle and cirrus.The ovary is oval in shape,71.8-92.3×76.8-97.4μm in size,situated in the middle of the body.The vitellaria are distributed on each side from the acetabulum to subterminal,consisting of many follicles.The uterus is short,convoluted between the anterior testis and the acetabulum,containing 0-6 eggs.The operculate eggs with thin shell are elliptical,yellowish,95.1-116.2×54.3-72.8 Mm in size.We also verified that pyquiton was effective against Echinochasmus Hliputanus.(Figs.1-4)