Already ill (such as cold or something), chronic illness (such as CF), medically compromised immune system (AIDS for example), poor nutrition, there are bunches.
exposure to pathogenetic organism (obviously). amount of pathogen youre exposed to (dose). virulence of infecting agent. strength of your immune system. previous vaccination/immunity.
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Already ill (such as cold or something), chronic illness (such as CF), medically compromised immune system (AIDS for example), poor nutrition, there are bunches.
Poor immune system, malnutrition, chronic physical illness, such as kidney failure, etc.
exposure to pathogenetic organism (obviously). amount of pathogen youre exposed to (dose). virulence of infecting agent. strength of your immune system. previous vaccination/immunity.
splenectomy and chemotherapeutic agents