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Toxocara canis (also known as dog roundworm) is a d helminth parasite of dogs and other canids. The name is derived from the Greek word "toxon," meaning bow or quiver, and the Latin word "caro," meaning flesh. They live in the small intestine of the definitive host. In adult dogs, the infection is usually asymptomatic but may be characterized by diarrhea.

Toxocariasis is caused by larvae of Toxocara canis (dog roundworm) and less frequently of T. cati (cat roundworm), two nematode parasites of animals. Toxocara canis accomplishes its life cycle in dogs, with humans acquiring the infection as accidental hosts. Unembryonated eggs are shed in the feces of the definitive host. Eggs embryonate and become infective in the environment.

Toxocariasis is the parasitic disease caused by the larvae of two species of Toxocara roundworms: Toxocara canis from dogs and, less commonly, Toxocara cati from cats. Toxocariasis is considered one of the Neglected Parasitic Infections, a group of five parasitic diseases that have been targeted by CDC for public health action. Image: Various stages of Toxocara canis larva hatching.

Clinical Toxocariasis is a product of Toxocara species migration through tissues. Toxocara canis primarily infects canids (dogs, foxes, and wolves) whereas T. cati primarily infects felids (cats). T. cati is thought to more frequently cause severe human disease. Children are more prone to infection via the fecal-oral route as they are more likely to consume Toxocara eggs by ingesting soil or other contaminated substances. Diagnosis of toxocariasis is difficult. While identification of the organism on microscopy is the gold standard, it is rarely achieved for practical reasons. Additionally, given that humans are not definitive hosts for Toxocara, stool microscopy is ineffective.

from Bloodstained Cuticula by Toxocara Canis. Toxocara Canis Hackettstown, New Jersey.

This article is about the organism. For the disease, see Toxocariasis. Adult Toxocara canis. Scientific classification.

Toxocara canis and Toxocara cati are perhaps the most ubiquitous gastrointestinal worms ( helminths ) of domestic dogs, cats, and foxes. There are many 'accidental' or paratenic hosts including humans, birds, pigs, rodents, goats, monkeys, and rabbits. In paratenic hosts, the larvae never mature and remain at the L2 stage. In this study, the adult patient presented with eosinophilic cellulitis, hepatosplenomegaly, anemia, and a positive ELISA for T. cani . .The incubation period for Toxocara canis and cati eggs depends on temperature and humidity. canis females, specifically, are capable of producing up to 200,000 eggs a day that require 2–6 weeks minimum up to a couple months before full development into the infectious stage. Under ideal summer conditions, eggs can mature to the infective stage after two weeks outside of a host.

Toxocara canis and Toxocara cati, zoonotic nematodes responsible for ocular and visceral larval migrans in people, are present in sub-Arctic regions of northern Canada and Alaska (Fig. 6). Their presence is not well documented in Arctic regions of North America, and neither species has been reported in Greenland. Toxocara canis is the main etiological agent of visceral and ocular larva migrans, covert toxocariosis (synonym: toxocariasis), and neurological toxocariosis in humans (Despommier, 2003). The dog and other canids (. coyote, fox, jackal, wolf) act as hosts, whereas every species of mammals including humans and birds can serve as paratenic hosts by harboring the second-stage larvae in their tissues.