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1.
Acta Parasitol ; 60(1): 154-7, 2014 Mar.
Article in English | MEDLINE | ID: mdl-26204034

ABSTRACT

Species of South American subterranean rodents belonging to the genus Ctenomys (commonly called tuco-tucos) are widely distributed across the southern Neotropical region. Despite their relatively well-studied biology and reproductive physiology, current knowledge of their ectoparasite fauna is limited to a few ambiguous studies, based on scattered samples from a small number of host individuals. Ctenomys talarum is the most widely distributed species in the genus. Lice (Phthiraptera) were collected from these tuco-tucos throughout their entire coastal range. Two species, one chewing louse (Gyropus parvus), and one sucking louse (Eulinognathus americanus) were collected. The distribution ranges for both louse species were extended with new locality records. No lice were found in two host populations. Furthermore, co-occurrence of both ectoparasites was not detected.


Subject(s)
Host-Parasite Interactions , Lice Infestations/veterinary , Phthiraptera/growth & development , Rodentia/parasitology , Animals , Lice Infestations/parasitology , Phylogeography , South America , Topography, Medical
2.
Clin Rev Allergy Immunol ; 34(3): 380-4, 2008 Jun.
Article in English | MEDLINE | ID: mdl-18159571

ABSTRACT

The integrated defense system has been shaped over eons showing noteworthy robustness by surviving a million-year prehistory, a comparatively short evolving history and current transformation. Self-identification being part of it, so are deviations manifold expressed in autoimmunity. Epidemiological incidence and intensity, both being subject of change, are focused in the light of the time factor. Furthermore, it is stressed that there is no bi-univocal mutual relationship between immunity and defense and the origins of autoimmunity still remain mysterious. We question whether the present transforming events have occurred within too short a time to be attributed to genetic predisposition exclusively.


Subject(s)
Autoimmune Diseases/immunology , Autoimmunity , Autoimmune Diseases/genetics , Autoimmunity/genetics , Bacteria/immunology , Biological Evolution , Genetic Predisposition to Disease , Humans , Time Factors
3.
J Parasitol ; 91(1): 127-30, 2005 Feb.
Article in English | MEDLINE | ID: mdl-15856885

ABSTRACT

Trichuris pampeana Suriano and Navone, 1994 (Nematoda: Trichuridae) is redescribed from voucher specimens from the type host Ctenomys azarae Thomas, 1903 (Rodentia: Octodontidae) and from parasites collected from 2 populations of the subterranean rodent C. talarum Thomas, 1898 from Mar de Cobo and Necochea, Buenos Aires Province, Argentina. After a revision of these nematodes, it was confirmed that the following characters were not considered in the original description: bacillary band, cells from the esophagointestinal junction, ejaculatory duct, vas deferens, adanal papillae, vagina, oviduct, and rectum. Additional information about the spicular sheath, vulva, uteri, and ovary is provided. The morphological features given in this redescription allow to confirm the identity of T. pampeana as a valid species and also to distinguish it more clearly from other species of the genus.


Subject(s)
Rodent Diseases/parasitology , Trichuriasis/veterinary , Trichuris/classification , Animals , Argentina/epidemiology , Female , Male , Prevalence , Rodent Diseases/epidemiology , Rodentia , Trichuriasis/epidemiology , Trichuriasis/parasitology , Trichuris/anatomy & histology
4.
Vet Parasitol ; 122(1): 27-33, 2004 Jun 10.
Article in English | MEDLINE | ID: mdl-15158554

ABSTRACT

This work is the first report of subterranean rodent Ctenomys talarum (Rodentia: Octodontidae) as intermediate host of Taenia taeniaeformis in urban areas of Mar de Cobo (Buenos Aires Province, Argentina) and to experimentally reproduce in domestic dogs the adult stage of this parasite. Prevalence, mean abundance and mean intensity of infection with T. taeniaeformis larvae in the liver and peritoneal cavity of C. talarum were 64%, 15.3 and 9.8, respectively. Ten adults of T. taeniaeformis were obtained from experimentally infected dogs. Information about the role of subterranean rodents in the life cycle of this parasite is also given. The above mentioned data indicate that T. taeniaeformis is a frequent parasite of this species of rodents, at least within the study area. Also explanations for the high prevalence of larval forms of this parasite in C. talarum populations are given.


Subject(s)
Rodent Diseases/parasitology , Rodentia/parasitology , Taenia/growth & development , Taeniasis/veterinary , Animals , Argentina/epidemiology , Dogs , Feces/parasitology , Female , Host-Parasite Interactions , Parasite Egg Count/veterinary , Prevalence , Rodent Diseases/epidemiology , Taeniasis/epidemiology , Taeniasis/parasitology , Urban Population
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