Trichinellosis

Trichinellosis is a parasitic zoonosis caused by Trichinella spp. ^[1]. One source emphasizes that the parasite completes a developmental cycle within a single host, and that infected muscle can serve as a reservoir of larvae with long-term survival ^[3]. The available source material does not provide additional disease-definition detail beyond this etiologic characterization ^[1][3].

Severe trichinellosis may involve the nervous system, and neurotrichinellosis is described as one of the most important complications of severe disease ^[1]. Reported frequent presentations include encephalopathy, neuromuscular disturbances, and ocular involvement, with encephalopathy noted as the presentation most responsible for fatalities ^[1]. Neurotrichinellosis can be fatal, especially when Trichinella spiralis is involved ^[1]. The source material does not provide a broader symptom chronology or non-neurologic clinical syndrome description.

The available literature identifies trichinellosis as a food-borne zoonosis of substantial public-health relevance, but also notes that information from Vietnam is scarce and fragmented ^[2]. Human cases are described as rare in countries where veterinary control of pig and horse meat is strict, while cases still occur with boar meat ^[4]. One source notes that the parasite’s biology, including long-term larval survival in muscle, has a profound influence on the epidemiology of the zoonosis ^[3]. Beyond this, source-backed detail on incidence, seasonality, or population distribution is not yet available.

Transmission occurs when humans ingest muscle tissues containing viable Trichinella larvae ^[3]. The sources specifically cite raw pork consumption as an epidemiologically relevant exposure factor in the context of neurotrichinellosis, and also mention boar meat as a continuing source of human cases ^[1][4]. No other transmission route is explicitly supported in the provided material.

Source-backed risk-group detail is limited. The provided material identifies people exposed to raw pork, boar meat, or other infected muscle tissues as relevant exposure groups ^[1][4][3]. It also indicates that severe neurotrichinellosis can occur and may be fatal, especially when Trichinella spiralis is involved, but does not define additional demographic or occupational high-risk groups ^[1].

The source material supports prevention through veterinary control of pig and horse meat, which is associated with rarity of human cases in countries where such control is strict ^[4]. It also implies the importance of avoiding consumption of infected muscle tissue, including raw pork and boar meat exposures ^[3][1][4]. One source warns that reducing prevention could allow public-health re-emergence, underscoring the need for sustained control measures ^[4].

For surveillance, trichinellosis should be read as a food-borne zoonosis whose occurrence may be underestimated when information is fragmented or local reports are inaccessible ^[2]. The available sources suggest that changes in prevention or meat-control practices may alter observed incidence, including re-emergence where controls weaken ^[4]. In monitoring contexts, epidemiologically linked exposures such as raw pork or boar meat are important contextual signals, but source-backed detail on standard case definitions or surveillance thresholds is not yet available ^[1][4].

1. 1 Bruschi F et al. Neurotrichinellosis. Handb Clin Neurol. 2013. PMID: 23829915. doi: 10.1016/B978-0-444-53490-3.00019-4. PubMed: https://pubmed.ncbi.nlm.nih.gov/23829915/
2. 2 Ng-Nguyen D et al. A systematic review of taeniasis, cysticercosis and trichinellosis in Vietnam. Parasit Vectors. 2017 Mar 21. PMID: 28320455. doi: 10.1186/s13071-017-2085-9. PubMed: https://pubmed.ncbi.nlm.nih.gov/28320455/
3. 3 Trichinellosis. Zoonoses. 1998. doi: 10.1093/oso/9780192623805.003.0060. DOI: https://doi.org/10.1093/oso/9780192623805.003.0060
4. 4 Houin R et al. Fasciolose, trichinellose et autres zoonoses parasitaires. Bull Acad Natl Med. 2014 Oct. PMID: 27120913. PubMed: https://pubmed.ncbi.nlm.nih.gov/27120913/
5. 5 Trichinellosis. Human Diseases from Wildlife. 2014. doi: 10.1201/b17428-32. DOI: https://doi.org/10.1201/b17428-32
6. 6 Trichinellosis. Concept of One Health and Zoonoses. 2026. doi: 10.1007/978-981-95-6627-3_34. DOI: https://doi.org/10.1007/978-981-95-6627-3_34

ICD-10

ICD-11

Total cases

30

Peak month

2019-01

Coverage

2 reporting countries · 2013-01-01 → 2026-06-20