<Ul> <Li> general health </Li> <Li> psychological characteristics and attitude </Li> <Li> nutritional state </Li> <Li> social ties </Li> <Li> previous exposure to the organism or related antigens </Li> <Li> haplotype or other specific genetic differences of immune function </Li> <Li> substance abuse </Li> <Li> race </Li> </Ul> <Li> psychological characteristics and attitude </Li> <Li> previous exposure to the organism or related antigens </Li> <Li> haplotype or other specific genetic differences of immune function </Li>

Factors that influence the susceptibility of a host