Download Microbial Physiology Genetics and Ecology by Dr. Jyotsna Rathi PDF

By Dr. Jyotsna Rathi

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By Dr. Jyotsna Rathi

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Sample text

Individuals ingesting the small (1-5 pm) resistant spores experience chronic diarrhea, dehydration, and significant weight loss. Some microsporidia species may be transmitted by the water route. Lm in diameter) that are shed for relatively long periods by asymptomatic carriers; it persists well in water and wastewater and may be subsequently ingested by new hosts. Level of cysts in raw wastewater may be as high as 5000 cysts/L. This protozoan parasite is transmitted to humans mainly via contaminated water and food.

4 Helminth Parasites Although helminth parasites are not generally studied by microbiologists, their presence in wastewater, along with bacterial and viral pathogens and protozoan parasites, is nonetheless of great concern as regards human health. lle and Necator americanus. Most of these infections are acquired by the foodborne route. The ova (eggs) constitute the infective stage of parasitic helminths; they are excreted in feces and spread via wastewater, soil, or food. The ova are very resistant to environmental stresses 40 MICROBIAL PHYSIOlOGY.

Astroviruses are the second leading cause of viral gastroenteritis in children and adults. The mild, watery diarrhea lasts for 3-4 days, but can be long-lasting in immunocompromised patients. , monoclonal antibodies) are now available for their diagnosis. After treatment with trypsin, astroviruses can grow in human embryonic kidney cultures or in Caco cell cultures. Infectious astroviruses can be detected in environmental samples through growth on tissue cultures followed by hybridization with a specific cDNA probe.

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