Crowding and Disease

Your three best doctors are faith, time, and patience. 

The spread of diseases among crowded BU is easier than among more isolated BU. Pathogens that are passed from one individual to another are less likely to be vimlent than pathogens that require a vector or alternate host, under normal conditions. That is because individual-to-individual contact cannot happen as readily if the individuals are so sick that they cannot move around. 

The crowding of individuals modifies this characteristic. Very virulent pathogens can spread from one individual to another if the second cannot escape the first. Thus, whereas natural selection 

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