Chapter 19: Viruses. (a). 2009 pandemic H1N1 influenza A virus. Viruses. In 2009, a general outbreak ( epidemic ) of a flu-like illness first appeared in Mexico and the United States Caused by an influenza virus H1N1 Flu epidemics= caused by new strains of influenza virus
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2009 pandemic H1N1influenza A virusViruses
Bacteriophages attacking E. coli cell
Zoonosis= infectious disease transmitted between humans and other animals
HIV only infects certain types of human white blood cells
(d) Bacteriophage T4
2. Lysogenic cycle
Lysis of host cell causes release of progeny phages
Genome integrates into bacterialchromosome as prophage, which(1) is replicated and passed on todaughter cells and(2) can be induced to leave the chromo-some and initiate a lytic cycle
The phage attaches to ahost cell and injects its DNA.
• Virulent or temperate phage
• Temperate phage only
• Destruction of host DNA
• Production of new phages
2. Vertical transmission= inheriting the virus from a parent