NATS 1870 Lecture Notes - Lecture 6: West Nile Fever, Lytic Cycle, Lysogenic Cycle
25 Jun 2017
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Document Summary
Virus: a piece of bad new wrapped up in a protein - most cases, this is incorrect. Humans: apart of our ecology (8% of genome) & infect all living things. Bacteria: infected by viruses that destroy them, controlling bacteria cells around us. Hpv: 80% of us will be infected in lifetime (herpes virus) Highly aggressive viruses: most common cause of acute human infections. 1918 spanish u: pandemic 40-50 million deaths worldwide. Dimitri iwanowski 1892: infected tobacco plant transmitting disease to other plants by something smaller than a bacteria (a virus) Protein: thought it was protein, but it was replicating & proteins cannot replicate on their own (needs a cell) Virus: virus particles (virions) - complexes of nucleic acids & proteins. 1. outside cell: virus particle (virion), no chemical activity & can bind to host cell receptors. 2. inside cell: infects the cell, ejected from cell & infects another cell.
