Occurrence of Trichinella spp. in rats on pig farms
More details
Hide details
National Veterinary Research Institute, Puławy, Poland
Institute of Rural Health, Lublin, Poland
Corresponding author
Ewa Bilska-Zając   

National Veterinary Research Institute, Puławy, Poland, Partyzantów Avenue, 57, 24-100 Puławy, Poland
Ann Agric Environ Med. 2018;25(4):698-700
The highest risk of trichinellosis for human is considered in eating meat products containing live larvae, mostly from wild boars or pigs. Spreading of Trichinella spp. may occur in various ways, one of which is transmission by vectors. The rat is considered to be the most common vector for Trichinella parasite. The population of rats living on pig farms can play an important role in maintaining or spreading the parasite to other animals.

The aim of presented survey was to investigate the occurrence of Trichinella spp. in rats on farms with pigs infected with this parasite.

Material and methods:
From pig farms selected for study, the muscles of collected rats were investigated by magnetic stirrer digestion method to assess occurrence of Trichinella in the rat population. Isolated Trichinella parasites were identified under stereomicroscope and multiplex PCR were performed for species identification.

Rats infected with Trichinella spp. were discovered on three of five investigated pig farms. The mean extent of invasion in rats from the studied farms was 23.33%. The calculated medium intensity of invasion was 4.09 lpg (larvae per gram) (SD 5.41). All larvae of Trichinella discovered from rats were identified as T.spiralis.

The results obtained indicate that in farms with a high prevalence of Trichinella invasion in pigs there are very likely to be found rats infected by this nematode. This suggests possibility to maintain the invasion in herd and spread into neighborhood farms.

Sattmann H, Prosl H. History of early research on trichinellae and trichinelloses. Wien Tierarztl Monat. 2005; 92(12): 283–7.
Leiby DA, Duffy CH, Murrell KD, Schad GA. Trichinella spiralis in an agricultural ecosystem – transmission in the rat population. J Parasitol. 1990; 76(3): 360–4.
Thi NV, Nguyen VD, Praet N, Claes L, Gabriel S, Huyen NT, Dorny P. Trichinella infection in wild boars and synanthropic rats in northwest Vietnam. Veterinary Parasitology. 2014; 200(1–2): 207–11.
Ramisz A, Balicka-Laurans A, Urban E. [Studies on the incidence of Trichinella in rats in the industrial animal husbandry establishments]. Wiad Parazytol. 1979; 25(5): 565–8.
Commission Implementing Regulation (EU) 2015/1375 of 10 August 2015 laying down specific rules on official controls for Trichinella in meat.
Zarlenga DS, Chute MB, Martin A, Kapel CM. A multiplex PCR for unequivocal differentiation of all encapsulated and non-encapsulated genotypes of Trichinella. Int J Parasitol. 1999; 29(11): 1859–67.
Stojcevic D, Zivicnjak T, Marinculic A, Marucci G, Andelko G, Brstilo M, Pavo L, Pozio E. The epidemiological investigation of Trichinella infection in brown rats (Rattus norvegicus) and domestic pigs in Croatia suggests that rats are not a reservoir at the farm level. J Parasitol. 2004; 90(3): 666–70.
Pozio E, Rinaldi L, Marucci G, Musella V, Galati F, Cringoli G, Boireau P, La Rosa G. Hosts and habitats of Trichinella spiralis and Trichinella britovi in Europe. Int J Parasitol. 2009; 39(1): 71–9.
Cabaj W. [Wild and domestic animals as permanent Trichinella reservoir in Poland]. Wiad Parazytol. 2006; 52(3): 175–9.
Jarvis T, Miller I, Pozio E. Trichinella britovi in domestic pig--a case report. Acta Vet Scand. 2002; 43(2): 131–4.
Murrell KD, Stringfellow F, Dame JB, Leiby DA, Duffy C, Schad GA. Trichinella spiralis in an agricultural ecosystem. 2. Evidence for natural transmission of Trichinella spiralis from domestic swine to wildlife. J Parasitol. 1987; 73(1): 103–9.
Smith HJ, Anzengruber A, DuPlessis DM. Current status of trichinosis in swine in the Atlantic provinces. Can Vet J. 1976; 17(3): 72–5.
Journals System - logo
Scroll to top