INFECTION
⁃ A disease caused by microorganism, esp. those that release toxins orb invade body tissues.⁃ Worldwide , infectious disease (e.g, malaria, tuberculosis, hepatitis virus, diarrhea illnesses) produce more disability and death than any other cause .
⁃ Infection differs from colonization of the body by microorganisms in that during colonization ,microbes reside harmlessly in the body or perform useful functions for it (e.g, bacteria in the gut that produce vita Mink).
⁃ By contrast , infection illnesses typically cause harm.
CAUSES
⁃ The most common pathogenic organism are bacteria including mycobacteria , cytoplasm, spirochetes , chlamydiae and rickets ) ,viruses, fungi protozoa and helminths.⁃ Life threatening infections disease usually occurs when immunity is weak or suppressed (e.g, in the first few months of life , old age , malnourished persons , trauma or burn victims, leukemic patients , and those with chronic illnesses such as diabetes mellifluous , renal failure, cancer, asplenia , alcoholism or heart, lung or liver disease ).
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