n Links b/t behavior, CNS, PNS, neuroendocrine hormones, immune system n Aversive stressors and disease susceptibility (viral, parasitic, neoplastic): shown in a variety of animal models n Effects depend on virulence of illness and psychosocial stressors:  e.g. Macaque monkeys infected with SIV: leukopenia, wt loss and survival affected by rearing conditions (with mother or peers), number of changes in housing (familiar social group, unfamiliar group, or isolation).
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