Helminth communities and host-parasite relationships in argentine brown rat (Rattus norvegicus)

AbstractThe aims of this research were: 1) to determine the helminth parasite fauna of seventy two Rattus norvegicus (Berkenhout, 1769) individuals inhabiting poultry farms in the Pampean region of Argentina; 2) to examine the relationship between parasitism and individual characteristics of the hosts, and 3) to analyze the associations among helminths. The study was carried out in twenty-four poultry farms from autumn 2000 to winter 2001. Nematodes were found in the intestine or caecum rectum of the 74 % of rats and cestodes were found along all the intestine of the 28 % of rats. Heterakis spumosa (Travassos 1914) was a central species, whereas Syphacia muris, Yamaguti 1941, Nippostrongylus brasiliensis (Travassos 1914) and Hymenolepis diminuta (Rudolphi 1819) were satellite species. Helminths do not affect rat survival and growth of rats. Rats parasitized with H. spumosa and H. diminuta were larger and older than non-parasitized rats. The intensity of infection with H. spumosa significantly increased with rat age. Rats parasitized with Nippostrongylus brasiliensis and Syphacia muris did not differ in size and age with respect to non-parasitized ones. The mean intensity of infections per host was 33.74, 74.28, higher than 200, and 3.10 for H. spumosa, S. muris, N. brasiliensis and H. diminuta, respectively. The mean intensity of infection with H. spumosa was higher in summer than in the other seasons, while the higher mean intensity of infection with N. brasiliensis and S. muris occurred in autumn. Infections with Heterakis spumosa and Syphacia muris, and with Syphacia muris and Nippostrongylus brasiliensis were independent; while Heterakis spumosa and Nippostrongylus brasiliensis were negatively associated.

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Helminths of the brown rat (Rattus norvegicus) (Berkenhout, 1769) in the city of Palermo, Italy

Helminthologia ◽

10.2478/s11687-010-0037-4 ◽

2010 ◽

Vol 47 (4) ◽

pp. 238-240 ◽

Cited By ~ 18

Author(s):

C. Milazzo ◽

A. Ribas ◽

J. Casanova ◽

M. Cagnin ◽

F. Geraci ◽

...

Keyword(s):

Rattus Norvegicus ◽

Infection Intensity ◽

Helminth Species ◽

Hymenolepis Diminuta ◽

Nippostrongylus Brasiliensis ◽

Syphacia Muris ◽

Brown Rat ◽

Males And Females ◽

Taenia Taeniaeformis ◽

The City

AbstractA helminthological survey was performed on 143 brown rats (Rattus norvegicus) from the city of Palermo (Italy). The overall prevalence of helminth infection was 98.60 %. The following parasites were found: Brachylaima sp. (prevalence 8.39 %) (Trematoda); Taenia taeniaeformis larvae (11.89 %), Rodentolepis nana (13.29 %), Hymenolepis diminuta (24.48 %) (Cestoda); Gongylonema sp., (4.90 %), Syphacia muris (8.39 %), Nippostrongylus brasiliensis (18.88 %), Eucoleus gastricus (30.07 %), Mastophorus muris (30.77 %), Capillaria hepatica (54.55 %), Heterakis spumosa (82.52 %) (Nematoda) and one acanthocephalan (0.70 %). The species found in males were also present in females, with the exception of the acanthocephalan. No significant differences were found between males and females in prevalence (P%) or mean infection intensity (MI). However, a significant correlation between both P% and MI, as well as host age, was observed in some helminth species. Hosts were infected by one to six helminth species (median = 3). This is the first report from Sicily of helminths in R. norvegicus.

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Endoparasitic Infection in Laboratory Rat Strain, Long-Evans (Rattus norvegicus Berkenhout, 1769)

Bangladesh Journal of Scientific and Industrial Research ◽

10.3329/bjsir.v44i1.2718 ◽

1970 ◽

Vol 44 (1) ◽

pp. 109-116 ◽

Cited By ~ 1

Author(s):

Farhana Muznebin ◽

Hamida Khanum ◽

Zaibun Nessa ◽

Dipa Islam

Keyword(s):

Key Words ◽

Rattus Norvegicus ◽

Parasite Species ◽

Hymenolepis Diminuta ◽

Helminth Parasite ◽

New Finding ◽

Syphacia Muris ◽

Rat Strain ◽

Long Evans ◽

Taxonomic Groups

In the present study, five helminth parasite species from two taxonomic groups were identified from Long-Evans (Rattus norvegicus Berkenhout, 1769). The cestodes were Vampirolepis nana Siebold, Hymenolepis diminuta Rud and nematodes were Citellina dispar Prendel, Heterakis spumosa Schneider and Syphacia muris Yamaguti. C. dispar is a new finding in Bangladesh. The highest prevalence of H. diminuta was recorded but the highest intensity was recorded in V. nana. The prevalence and intensity of V. nana was 56.25% and 65.11±13.23; H. dimisnuta was 72.92% and 4.37±0.89; C. dispar was 62.50% and 19.63 ±2.10; H. spumosa was 66.67% and 9.06±1.85; and S. muris was 64.58% and 24.65±2.60 respectively. Differences in prevalence and intensity due to sexes and seasons were also evaluated. Key words: Cestodes, Nematodes, Helminth, Prevalence, Intensity. doi: 10.3329/bjsir.v44i1.2718 Bangladesh J. Sci. Ind. Res. 44(1), 109-116, 2009

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The relationship between IgA activity against 4th-stage larvae and density-dependent effects on the number of 4th-stage larvae ofTeladorsagia circumcinctain naturally infected sheep

Parasitology ◽

10.1017/s0031182004005736 ◽

2004 ◽

Vol 129 (3) ◽

pp. 363-369 ◽

Cited By ~ 44

Author(s):

M. J. STEAR ◽

K. BAIRDEN ◽

G. T. INNOCENT ◽

S. MITCHELL ◽

S. STRAIN ◽

...

Keyword(s):

Negative Binomial Distribution ◽

Binomial Distribution ◽

Negative Binomial ◽

Infection Intensity ◽

Intensity Of Infection ◽

Mean Intensity ◽

Teladorsagia Circumcincta ◽

The Mean ◽

Low Levels ◽

The Relationship

The number ofTeladorsagia circumcincta4th-stage larvae in naturally infected lambs from a single farm varied among lambs and among different years. Within each year the distribution of 4th-stage larvae among lambs was similar to that expected from a negative binomial distribution. The ratio of 4th-stage larvae to adultT. circumcinctawas low in two years with a low mean intensity of infection but high in two years with a higher mean intensity of infection. The negative binomial distribution is defined by the mean and byk, a parameter that measures dispersion;kwas low when mean infection intensity was low but higher when mean infection intensity was high. Askis an inverse index of overdispersion this indicated that the distribution of 4th-stage larvae was more overdispersed at low levels of infection. In a combined analysis, the number of adultT. circumcinctaand the plasma IgA activity against 4th-stage larvae were both associated with increased numbers of 4th-stage larvae. There was a statistical interaction between the number of adults and IgA activity that moderated their combined effect.

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Hymenolepis diminuta and Rodentolepis nana (Hymenolepididae: Cyclophyllidea) in urban rodents of Gran La Plata: association with socio-environmental conditions

Journal of Helminthology ◽

10.1017/s0022149x17000864 ◽

2017 ◽

Vol 92 (5) ◽

pp. 549-553 ◽

Cited By ~ 1

Author(s):

B. Fitte ◽

M.R. Robles ◽

A. Dellarupe ◽

J.M. Unzaga ◽

G.T. Navone

Keyword(s):

Environmental Conditions ◽

Rattus Norvegicus ◽

Animal Health ◽

Rattus Rattus ◽

Zoonotic Diseases ◽

Hymenolepis Diminuta ◽

Water Bodies ◽

Morphometric Characters ◽

Mean Intensity ◽

La Plata

AbstractThe aim of this survey was to study two Hymenolepididae species in urban rodents, Rattus rattus and Rattus norvegicus, and to analyse factors that favour their presence in the environment and pose a sanitary risk. Hymenolepis diminuta and Rodentolepis nana were found in R. rattus and R. norvegicus in different proportions. Values of prevalence, mean abundance and mean intensity were recorded, and new morphometric characters were described, adding to previously known information. No significant differences were found. However, the results revealed that there is a tendency for these parasites to develop in areas with deficient socio-structural conditions and in water bodies. This study thereby shows that certain areas on the periphery of the Gran La Plata favour the existence of rodents, which act as sentinels of zoonotic diseases, and stresses the need to take action to minimize them in order to avoid putting human and animal health at risk.

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Research Note. Occurrence of gastrointestinal helminths in commensal rodents from Tabasco, Mexico

Helminthologia ◽

10.1515/helm-2017-0014 ◽

2017 ◽

Vol 54 (2) ◽

pp. 170-173 ◽

Cited By ~ 2

Author(s):

N. Cigarroa-Toledo ◽

Y. De Los Santos-Martinez ◽

C. V. Zaragoza-Vera ◽

M. M. Garcia-Rodriguez ◽

C. M. Baak-Baak ◽

...

Keyword(s):

Rattus Rattus ◽

Hymenolepis Diminuta ◽

Nippostrongylus Brasiliensis ◽

Gastrointestinal Helminths ◽

Trichuris Muris ◽

Heligmosomoides Polygyrus ◽

Syphacia Muris ◽

Commensal Rodents ◽

Syphacia Obvelata ◽

Moniliformis Moniliformis

Summary The aim of this study was to determine the prevalence and species composition of helminths in commensal rodents captured inside private residences in the city of Villahermosa in Tabasco, Mexico. Trapping was performed at each house for three consecutive nights from October to December 2015. Fifty commensal rodents were captured: 23 Rattus norvegicus, 16 Mus musculus and 11 Rattus rattus. Rodents were transported alive to the laboratory and held in cages until they defecated. Feces were analyzed for helminth eggs using the Sheather’s flotation technique. The overall prevalence of helminths in rodents was 60 %: R. norvegicus was more likely to be parasitized (87.0 %) than R. rattus (63.6 %) and M. musculus (18.8 %). Eggs from at least 13 species of helminths were identified: Hymenolepis diminuta, Rodentolepis nana, Moniliformis moniliformis, Heligmosomoides polygyrus, Heterakis spumosa, Mastophorus muris, Nippostrongylus brasiliensis, Strongyloides ratti, Syphacia obvelata, Syphacia muris, Toxocara sp., Trichosomoides crassicauda, and Trichuris muris. This is the first study to report the presence of H. polygyrus, S. ratti and T. crassicauda in commensal rodents in Mexico. In conclusion, our results suggest that helminths commonly infect commensal rodents in Villahermosa and therefore rodents present a health risk to inhabitants in this region.

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Abomasal nematodes from three Norwegian wild reindeer populations

Canadian Journal of Zoology ◽

10.1139/z87-105 ◽

1987 ◽

Vol 65 (3) ◽

pp. 677-680 ◽

Cited By ~ 18

Author(s):

Karstein Bye

Keyword(s):

Life History ◽

Physical Condition ◽

Rangifer Tarandus ◽

Host Population ◽

Intensity Of Infection ◽

Mean Intensity ◽

Life History Parameters ◽

Teladorsagia Circumcincta ◽

The Mean ◽

Wild Reindeer

Three separate populations of wild reindeer (Rangifer tarandus tarandus L.) in Norway were examined for the presence of abomasal nematodes. The following six species were recorded: Ostertagia grühneri, Skrjabinagia arctica, Trichostrongylus axei, Teladorsagia circumcincta, Teladorsagia davtiani, and Nematodirus tarandi. Ostertagia grühneri dominated both in prevalence and intensity of infection. Teladorsagia davtiani occurred in only one of the populations investigated, and N. tarandi was found in calves only. Reindeer and sheep grazed the same areas, but no evidence of transfer of parasites from sheep to reindeer was found. All 72 adult reindeer and 10 calves examined during February–April harboured adult abomasal nematodes. The mean intensity of abomasal nematodes was highest in the population with the highest density of reindeer. Reindeer from this population were in poor physical condition. The influence of abomasal nematodes on life-history parameters of the host population is discussed.

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Helminth fauna of Rattus norvegicus Berkenhout, 1769 from the Belgrade area, Serbia

Archives of Biological Sciences ◽

10.2298/abs1004091k ◽

2010 ◽

Vol 62 (4) ◽

pp. 1091-1100 ◽

Cited By ~ 11

Author(s):

D. Kataranovski ◽

Milena Kataranovski ◽

Isidora Deljanin

Keyword(s):

Rattus Norvegicus ◽

Intestinal Parasites ◽

Helminth Fauna ◽

Hymenolepis Diminuta ◽

Multiple Infections ◽

Nippostrongylus Brasiliensis ◽

Trichuris Muris ◽

Age Related ◽

Parasite Infections ◽

Norway Rats

The aims of this study were to provide baseline knowledge about intestinal parasites in Norway rats (Rattus norvegicus) that inhabit the Belgrade area, and to analyze the associations among helminths. Of 302 trapped rats, 52% were females and 48% males, with 39% and approx. 37% of juvenile-subadult individuals, per sex, respectively. The following parasites were detected (with their respective prevalence): Cestoda - Hymenolepis diminuta (30.46%) and Rodentolepis fraterna (12.58%); Nematoda - Heterakis spumosa (36.75%), Nippostrongylus brasiliensis (16.22%), Capillaria sp. (5.96%), Trichuris muris (5.96%), Syphacia muris (4.30%) and Strongylus sp. larvae (0.33%). Flukes (Trematoda) were not recorded. Of all examined rats, 68.54% were found to harbor at least one parasite species, with higher prevalence in male hosts and in adult individuals. There were no age-related differences in the prevalence of infection with individual helminth species. Multiple infections occurred with up to four species per rat showing different combinations of parasite infections. These are the first records of the gastrointestinal helminth fauna of Norway rats in Serbia.

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Patterns of helminth infections in Rattus rattus and Mus musculus from two Mayan communities in Mexico

Journal of Helminthology ◽

10.1017/s0022149x19000063 ◽

2019 ◽

Vol 94 ◽

Author(s):

J.A. Panti-May ◽

E.E. Palomo-Arjona ◽

Y.M. Gurubel-González ◽

R.C. Barrientos-Medina ◽

M.C. Digiani ◽

...

Keyword(s):

Mus Musculus ◽

Linear Models ◽

Rattus Rattus ◽

Positive Association ◽

Hymenolepis Diminuta ◽

Nippostrongylus Brasiliensis ◽

Intensity Of Infection ◽

Gastrointestinal Helminths ◽

Trichuris Muris ◽

Black Rat

Abstract The black rat Rattus rattus and the house mouse Mus musculus are two commensal rodent species that harbour and shed zoonotic pathogens, including helminths. The aim of this survey was to study the helminth community and the patterns of infections in R. rattus and M. musculus from two Mayan communities in Mexico. Gastrointestinal helminths were isolated from 322 M. musculus and 124 R. rattus, including Gongylonema neoplasticum, Hassalstrongylus aduncus, Hassalstrongylus musculi, Hydatigera taeniaeformis metacestode, Hymenolepis diminuta, Nippostrongylus brasiliensis, Oligacanthorhynchidae gen. sp., Syphacia muris, Syphacia obvelata, Rodentolepis microstoma and Trichuris muris. The overall richness of helminths was seven in R. rattus and six in M. musculus. The results of generalized linear models showed that juvenile rodents had lower probabilities of being infected with G. neoplasticum, H. taeniaeformis and H. musculi than adult rodents. A positive association between the prevalence of S. muris and rat abundance was found. The intensity of infection with S. muris was higher in the rainy season than in the dry season; the opposite result was found for H. musculi infection. Male R. rattus harboured more S. muris specimens. The intensity of infection with T. muris was inversely associated with mouse abundance. The presence of the zoonotic H. diminuta, as well as H. taeniaeformis and R. microstoma in rodent populations indicates that there is risk of transmission, and that their entire life cycle occurs in the study area.

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Saccharomyces boulardii reduces the mean intensity of infection in mice caused by the consumption of liver contaminated by Toxocara canis

Parasitology Research ◽

10.1007/s00436-019-06567-5 ◽

2019 ◽

Vol 119 (3) ◽

pp. 1161-1165

Author(s):

Paula Dutra Cardoso ◽

Débora Liliane Walcher ◽

Priscila da Silva Cadore ◽

Ana Carolina Beheregaray ◽

Luis Augusto Xavier Cruz ◽

...

Keyword(s):

Toxocara Canis ◽

Saccharomyces Boulardii ◽

Intensity Of Infection ◽

Mean Intensity ◽

The Mean

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First report of Nematomystes scapteromi (Ganzorig, Oku, Okamoto, Malgor & Kamiya, 1999) Jiménez-Ruiz & Gardner, 2003 (Nematoda, Aspidoderidae) in Scapteromys tumidus Waterhouse, 1837 (Rodentia, Sigmodontinae) from southern Brazil

Check List ◽

10.15560/11.2.1607 ◽

2015 ◽

Vol 11 (2) ◽

pp. 1607

Author(s):

Leandro Ramos Duarte ◽

Moisés Gallas ◽

Eliane Fraga da Silveira ◽

Eduardo Périco

Keyword(s):

Rio Grande ◽

The State ◽

Southern Brazil ◽

Rio Grande Do Sul ◽

Intensity Of Infection ◽

Morphometric Traits ◽

Mean Intensity ◽

First Report ◽

The Mean

Prior to the present study, Nematomystes scapteromi (Ganzorig, Oku, Okamoto, Malgor & Kamiya, 1999) Jiménez-Ruiz & Gardner, 2003 had been reported in Scapteromys tumidus Waterhouse, 1837 from Uruguay. Here, eight specimens of S. tumidus were collected in southern Brazil and necropsied. The nematodes encountered were determined as N. scapteromi through their morphometric traits. Prevalence was 87.5% and the mean intensity of infection of 18.3 helminths/host. This is the first report of N. scapteromi parasitizing S. tumidus in the state of Rio Grande do Sul, Brazil.

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