An investigation in congenital transmission of Toxoplasma gondii as a potential mode of transmission in mice and humans

Thomasson, D 2011, An investigation in congenital transmission of Toxoplasma gondii as a potential mode of transmission in mice and humans , PhD thesis, Salford : University of Salford.

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Toxoplasma gondii is a pathogenic Apicomplexan parasite with a worldwide distribution in almost all warm blooded animals. The parasite is transmitted to hosts in three ways; via oocysts that are passed from the definitive host the cat; by the ingestion of tissue cysts by carnivory and by congenital transmission. The first two routes being thought to be the most important modes of transmission. Mice are thought to be primarily infected by the ingestion of oocysts in the environment while the consumption of infected meat is thought to be the major source of human infection. Recent data suggests, however, that vertical transmission may be important in both of these species. This investigation uses PCR to address this issue. Apodemus sylvaticus collected over a period of seven years from a rural area of Yorkshire were tested by PCR and a prevalence of 46% was found in this population. As there are few cats in this area, oocysts are not thought to be the source of infection. A natural population of Mus domesticus captured by a pesticide company and housed in a closed colony since 1991 were found to have alOO% prevalence of Toxoplasma and all animals were infected with the same strain type, Type 1. These studies suggest that congenital transmission may be occurring at high frequency.Congenital transmission in humans in the U.K. is thought to be rare. To determine if congenital transmission occurs in normal healthy newborn babies we set up an ethically robust protocol to collect umbilical cords from babies born in a hospital in the U.K. Preliminary results show that T. gondii was detected in 65% of the cords and all three different strain types were found. In conclusion congenital transmission may occur much more frequently than previously thought in natural populations of animals and humans.

Item Type: Thesis (PhD)
Contributors: Hide, G (Supervisor)
Schools: Schools > School of Health Sciences
Depositing User: Institutional Repository
Date Deposited: 03 Oct 2012 13:34
Last Modified: 04 Aug 2022 11:24

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