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Fasciolosis Reinfection in Japan
Kumiko Akiyoshi1, Mio Kokubo-Tanaka2, Shuichiro Yamauchi1
1Department of Cardiology and Clinical Examination, Faculty of Medicine, Oita University, Japan.
Internal Medicine (Tokyo, Japan)
|August 20, 2025
Summary
Fasciolosis, a food-borne parasitic zoonosis affecting livestock and humans, can lead to reinfection. This case highlights environmental contamination with Fasciola metacercariae in a farmer's residence, involving snails, deer, and cattle.
Area of Science:
- Veterinary Medicine
- Parasitology
- Public Health
Background:
- Fasciolosis is a significant food-borne parasitic zoonosis primarily impacting ruminants and humans.
- Clinical signs include abnormal liver imaging and eosinophilia.
- Reinfection is possible, posing a public health challenge.
Purpose of the Study:
- To report a case of human fasciolosis reinfection in a Japanese livestock farmer.
- To investigate the environmental factors contributing to the infection.
- To understand the transmission dynamics in a mixed farming environment.
Main Methods:
- Case reporting of a 77-year-old male livestock farmer with recurrent fasciolosis.
- Environmental investigation of the patient's residence and surrounding areas.
- Identification of intermediate host snails (e.g., Lymnaeidae) and final hosts (e.g., sika deer, cattle) harboring Fasciola.
Main Results:
- The patient experienced a second episode of fasciolosis.
- Intermediate host snails and sika deer, a natural final host, were found at the patient's residence.
- Infected cattle were also present on the farm.
- Fasciola metacercariae contamination was identified in the living environment.
Conclusions:
- The patient's workplace and residence were likely contaminated with Fasciola metacercariae.
- Environmental factors, including the presence of snails and infected animals, contributed to reinfection.
- Integrated control strategies are necessary to prevent human and animal fasciolosis.
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