Dermatobia Hominis and Myiasis

Dermatobia Hominis and Myiasis - Justin Tsu Bio 171...

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Justin Tsu Bio 171 Oestridae and Myiasis-based Parasitism in Hosts Introduction The family Oestridae consisting of bot flies parasitizes mice by limiting their reproductive functions and overriding immune system responses of hosts. The subfamilies of Oestridae are Oestrinae, Gasterophilinae, Hypodermatinae, and Cuterebrinae and are further split into numerous genera based on the selected host. A few species examined in this paper are Dermatobia hominis, Cuterebra Fontinella, and Oestrum Ovis. These species inflict on hosts what is called myiasis, or the invasion and infestation of parasitic larvae in the living or dead tissues of the host. As a result, myiasis is detrimental and beneficial to the host but is more advantageous for the parasite as the host provides shelter and nutrition for growing larvae. There are three methods through which myiasis can occur: Dermal or subdermal, nasopharyngeal, and intestinal. In dermal or subdermal myiasis, the skin is penetrated and swellings called furuncles occur. In nasopharyngeal myiasis, the nostrils or mouth are invaded with larvae and the sinuses are subsequently penetrated. Finally, intestinal myiasis occurs when eggs deposited on the host are consumed. Hence, myiasis contributes to negative effects on vital rates of mice and other hosts in host-parasite relationships with D. hominis, C. Fontinella, and other Oestrid species (Colwell et al. 2006). Body Parasitism is defined as a relationship where one benefits at the other’s expense. Oestrid larvae are indeed parasitic of mice. Bot fly species C. Fontinella depends on and benefits from the white-footed mouse ( Peromyscus leucopus) to complete the former’s life cycle. Relying on nutrients and proteins of mice hosts to grow, C. Fontinella absorbs these from P. leucopus tissue after myiasis (infection). On the contrary, the disadvantaged infected hosts change behaviors such as economizing space, movement, or grooming (Cameron et al . 2006). This is due to the
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large size of the parasite relative to the host, which impedes movement in the latter (Cameron et al . 2009). Likewise, infected P. leucopus
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This note was uploaded on 01/16/2012 for the course BIO 171 taught by Professor Josephinekurdziel during the Fall '08 term at University of Michigan.

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Dermatobia Hominis and Myiasis - Justin Tsu Bio 171...

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