Paller Vachel Gay, Samudio Jasmin Ayyah, Patagnan Kim Louisse, Santamaria Lyle, Tolentino Alco Kenneth, Ligalig Clark, Posa Gabrielle Ann, Amongo Jan Marion
Animal Biology Division, Institute of Biological Sciences, University of the Philippines Los Baños, Los Banos, 4031 Laguna Philippines.
School of Environmental Science and Management, University of the Philippines Los Baños, Los Baños, 4031 Laguna Philippines.
J Parasit Dis. 2021 Sep;45(3):634-642. doi: 10.1007/s12639-020-01340-3. Epub 2021 Jan 8.
Paragonimiasis, the disease caused by , is transmitted primarily by freshwater crabs in the Philippines. Human infection has been recorded, but there is a dearth of published information on the extent of infection in animal reservoirs, particularly in crabs and snails. This study aimed to investigate the infection status and risk factors of in freshwater crabs and melaniid snails collected in an endemic village along Cadacan River in Irosin, Sorsogon, where human cases of paragonimiasis were previously reported. A total of 246 freshwater crabs (118 females, 128 males) were dissected, and the gills, muscles, gonads, and viscera were examined for the presence of metacercariae; of which, 41.87% were found infected. The metacercariae were recovered from the gills (100%) and muscle tissues (7.3%) of infected crabs. Male crabs were more likely to be infected (49.22%) than female crabs (33.90%) ( < 0.05). Moreover, 70.87% of crabs showed low parasite intensity levels at ≤ 30 metacercariae/g tissue. A negative weak correlation was observed between parasite intensity and crab weight and carapace length, i.e., highly infected crabs were found to be smaller in size. Meanwhile, only 12% of the 150 melaniid snails collected were positive with cercariae with and as the most infected species. Household survey conducted revealed that some knowledge, attitudes, and practices of the locals contribute to the sustained transmission of the parasite in this endemic area. These findings revealed that is still prevalent among intermediate hosts and that some social and environmental factors contributed to the sustained parasite transmission in this endemic community.
肺吸虫病是由[具体病原体未给出]引起的疾病，在菲律宾主要通过淡水蟹传播。已有人类感染的记录，但关于动物宿主尤其是蟹和蜗牛的感染程度，公开信息匮乏。本研究旨在调查在索索贡省伊罗辛市卡达坎河沿岸一个流行村庄采集的淡水蟹和黑蜷螺中[具体病原体未给出]的感染状况及危险因素，该村庄此前曾报告过肺吸虫病病例。共解剖了246只淡水蟹（118只雌性，128只雄性），检查其鳃、肌肉、性腺和内脏是否有囊蚴；其中41.87%被发现感染。囊蚴从感染蟹的鳃（100%）和肌肉组织（7.3%）中检出。雄蟹比雌蟹更易感染（49.22%对33.90%）（P<0.05）。此外，70.87%的蟹寄生虫强度水平较低，每克组织囊蚴≤30个。观察到寄生虫强度与蟹体重和甲壳长度呈负弱相关，即感染严重的蟹体型较小。同时，在采集的150只黑蜷螺中，只有12%的尾蚴呈阳性，[具体感染种类未给出]为感染最严重的种类。进行的家庭调查显示，当地居民的一些知识、态度和行为习惯促成了该寄生虫在这个流行地区的持续传播。这些发现表明[具体病原体未给出]在中间宿主中仍然流行，并且一些社会和环境因素促成了该寄生虫在这个流行社区的持续传播。
