01.06.10 - Jan 6th Vi ruses non-living ( not capable of...

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Jan 6 th Viruses – non-living (not capable of reproduction), nucleic acids surrounded by protein coat and very small. The most common “life-form” bacteriophages – viruses that infect bacteria DNA/RNA – encode relatively few proteins. Note: very few drugs used against viruses because they use our cells for reproduction. Coughing as a double spearhead – body trying to expel virus, virus trying to spread Host Specificificity a general trait: few viruses can infect multiple host species. Zoonoses (infections that spread from animals to humans) vs. Human specific viruses Transmission through muiltiple routes: direct contact, transfusion, aerosol, vector (often arthropods), contaminated food/water (viruses cannot replicate in water – key factor) Environmental stability is variable – key factor in determining transmission in water Water transmitted viruses – source is human fecal material – cause diarrhea, meningitis, hepatitis examples: enteroviruses, hepatitis, norovirus Other examples: dengue fever – prevailing and spreading, yellow fever, encephalitis, west nile virus – all related to water because mosquitos bread in water Electron transport dependent upon iron – obtained by male mosquitos by sucking blood. Bacteria – prokaryotic
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This note was uploaded on 08/10/2011 for the course PARA 515 taught by Professor Timothygeary during the Winter '10 term at McGill.

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01.06.10 - Jan 6th Vi ruses non-living ( not capable of...

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