disease transmission, horizontal – basic reproduction number – disease transmission, patient-to-professional – disease transmission, professional-to-patient – disease transmission, vertical – disease vectors – arthropod vectors – arachnid vectors – insect vectors – drug contamination – endemic diseases – environmental medicine – environmental microbiology – air microbiology – food microbiology – soil microbiology – water microbiology – environmental pollution – air pollution – air pollution, indoor – air pollution, radioactive – dust – cosmic dust – smog – smoke – tobacco smoke pollution – vehicle emissions – body burden – drug residues – pesticide residues – environmental exposure – environmental monitoring – inhalation exposure – maternal exposure – maximum allowable concentration – occupational exposure – maximum allowable concentration – threshold limit values – paternal exposure – food contamination – food contamination, radioactive – food microbiology – food parasitology – noise – noise, occupational – noise, transportation – waste products – hazardous waste – radioactive waste – industrial waste – medical waste – dental waste – medical waste disposal – sewage – water pollution – water pollution, chemical – acid rain – water pollution, radioactive – epidemiologic factors – age factors – age of onset – maternal age – bias (epidemiology) – observer variation – selection bias – causality – precipitating factors – risk factors – comorbidity – confounding factors (epidemiology) – effect modifiers (epidemiology) – cohort effect – healthy worker effect – placebo effect – observer variation – reproductive history – gravidity – parity – sex factors – epidemiologic measurements – biometry – anthropometry – body mass index – cephalometry – crown-rump length – demography – age distribution – censuses – family characteristics – birth order – health status – geriatric assessment – population density – population dynamics – emigration and immigration – health transition – population control – population growth – residence characteristics – catchment area (health) – housing – residential mobility – sex distribution – sex ratio – vital statistics – life expectancy – life tables – morbidity – basic reproduction number – incidence – prevalence – mortality – cause of death – child mortality – fatal outcome – fetal mortality – hospital mortality – infant mortality – maternal mortality – survival rate – pregnancy rate – birth rate – risk assessment – epidemiologic methods – contact tracing – data collection – geriatric assessment – health surveys – behavioral risk factor surveillance system – dental health surveys – dental