ASU BIO 162 - parasites (18 pages)

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parasites



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parasites

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Pages:
18
School:
Arizona State University
Course:
Bio 162 - Microbiology Concepts for Allied Health
Microbiology Concepts for Allied Health Documents

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Eukaryotic Microbes Parasites Protozoa Helminths Arthropods Eukaryotic Microbes Table 12 1 Protozoa Life Stages Trophozoite vegetative feeding mostly motile Cyst dormant protective thick wall Most are free living in water and soil Classified by motility life cycle Subdivided by location in human host GI blood GU 1 2 3 4 Sarcodina Amoeba move by pseudopods Ciliophora Ciliates move by cilia Mastigophora Flagellates move by flagella Apicomplexan Sporozoa complex life cycle 1 Diversity among Protozoa Amoeba Entamoeba histolytica Amoebic dysentery Naegleria primary amoebic meningoencephalitis Acanthamoeba contact lens contaminant Figure 12 18a Amoebae Protozoa with no truly defined shape Move and acquire food through the use of pseudopodia Found in water sources throughout the world Few cause disease 2 Entamoeba histolytica Carried asymptomatically in the digestive tracts of humans No animal reservoir exists Infection usually occurs by drinking water contaminated with feces that contain cysts Trophozoites migrate to the large intestine where they multiply Entamoeba histolytica Three types of amebiasis can result from infection Luminal amebiasis Least severe form that is asymptomatic Invasive amebic dysentery More common form of infection Characterized by bloody mucus containing stools and pain Invasive extraintestinal amebiasis Trophozoites carried via the bloodstream throughout the body Maintaining clean water is important in prevention The Course of Amoebiasis Due to Entamoeba histolytica 3 Acanthamoeba and Naegleria Cause rare and usually fatal brain infections Common inhabitants of natural waterways as well as artificial water systems Contact lenses wearers who use tap water to wash their lenses can become infected Acanthamoeba diseases Infection occurs through cuts or scrapes the conjunctiva or through inhalation Acanthamoeba keratitis results from conjunctival inoculation Amebic encephalitis is the more common disease Acanthamoeba and Naegleria Naegleria disease



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