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目的探讨龙海市褐云玛瑙螺感染广州管圆线虫情况。方法按不同调查点,采集褐云玛瑙螺,用捣碎匀浆法,检查广州管圆线虫Ⅲ期幼虫。结果调查5个乡镇11个调查点,褐云玛瑙螺广州管圆线虫感染率为37.22%(166/446)。民宅院内外的垃圾或杂物堆放等、菜地或路边草丛、公园花圃等3类生境的褐云玛瑙螺广州管圆线虫感染率分别为70.75%(104/147)、23.65%(57/241)和8.62%(5/58),不同类型生境调查点螺广州管圆线虫感染率差异有统计学意义(χ2=110.011,P<0.05)。同一类生境,大螺的感染率及感染度均高于中小螺,但螺感染强度偏高的调查点,大螺与中小螺的感染率无差异。幼虫主要寄生于螺内脏软体部分,其中内脏、肺囊和肌肉的幼虫数分别占总幼虫数的91.74%、4.51%和3.75%。海橙调查点平均每只感染螺含幼虫59.30条。结论龙海市褐云玛瑙螺分布广泛,广州管圆线虫感染与其生态环境关系密切,当地为重度感染广州管圆线虫病自然疫源地。
Objective To investigate the infection of Helicoverpa armigera in China. Methods According to different investigation points, A. niloticus was collected, and the third instar larvae of C. elegans were examined by mashed homogenization method. Results Eleven investigation sites in 5 townships were surveyed. The infection rate of C. elegans was 37.22% (166/446). The infection rate of A. cantonensis was 70.75% (104/147) and 23.65% (57/57%) respectively in three habitats such as vegetable field or roadside grassland and park flower garden, 241) and 8.62% (5/58), respectively. There were significant differences in infection rates of C. elegans from different habitats (χ2 = 110.011, P <0.05). The same type of habitat, snail infection rate and infection were higher than the snail, but the spiral infection intensity of the survey points, large snail and snail infection rate was no difference. The larvae were mainly parasitized in the part of splanchnic viscera, which accounted for 91.74%, 4.51% and 3.75% of the total number of larvae in viscera, lung sac and muscle respectively. An average of 59.30 larvae were found in the sea orange survey sites. CONCLUSIONS The brown snakehead snails in Longhai City are widely distributed. The infection of C. elegans has a close relationship with its ecological environment. The locality is a natural foci of severe infection with C. elegans.