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Host factors contributing to emergence are:
1.Mass
migration of people provoked by natural and man made disaster with
concomitant rehabilitation of displaced people in temporary human
settlements under unhygienic conditions.
2.Uninhibited
and reckless industrialization leading to migration of labor population
from rural to urban areas in unhygienic squatter settlements
3.International
travel as a result of trade and tourism contributing to global
dispersion of disease agents, disease reservoirs and vectors
4.Changes
in lifestyle that promote unhealthy and risk prone behavior patterns
affecting food habits and sexual practices.
5.Declining
immunity of as a result of HIV infection, which make him vulnerable to a
host of infections.
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