infection - the invasion and proliferation of pathogens in body tissues, micro-organisms - living things that are too small to see without magnification, pathogen - disease-causing micro-organisms, sputum - fluid the people cough up from the lungs, ergonomics - the designs and arrangements of objects so people interact with them more efficiently and safely, pH - a measure of the acidity or alkalinity of a substance, mucous membrane - inner lining of tubula.r structures, including the mouth, nose, genitals, fomite - any nonliving object capable of carrying infectious micro-organisms, immunocompromised - having a impaired immune response, varicella - viral infection that causes a blister-like rash, itching, fatigue, and fever (chickenpox),

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