a. Explain what characteristics of virus and host make zoonotic diseases possible and difficult to control.
b. Make a diagram that details the progression of arboviruses from deep in the Amazon rain forest to Florida or from Central Africa to Seattle, Washington (as happened with West Nile fever).
c. Observe the graph showing case reports for arboviral encephalitis from 1998€“2003. Describe the general pattern that is evident and analyze the factors that would cause it.

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Encephalitis/Meningitis, Arboviral, California Serogroup. Number of reported cases, by month of onset-United States, 1998-2003 50 45 40 35 30 25 Z 20 15 10 1998 1999 2000 2001 2002 2003 Year and month