Epidemic - A disease that clearly exceeds the normal or expected frequency in a community or region, Pandemic - An Epidemic that is worldwide in distribution, Endemic - The continual presence of a disease or infections agent in a particular area or population, Host - An organism that harbors a pathogen, Agent - A disease causing factor or contibution to a health related issue, Environment - All external factors surrounding the host, Passive Immunity - Short-term, aquired naturally or artifiscially, Active Immunity - long term, aquired naturally or artifiscially, Cross-immunity - immunity to one agent providing immunity to another agent, Herd-immunity - immunity level in a population group, Research Process for an Epidemiologic study, first step - Identify the problem, Research Process for an Epidemiologic study, last step - Disseminate findings, Direct transmission - Spread of infection through immediate contact with an infected person or their secretions, Vector transmission - Spread of disease via an organism (e.g., mosquito) that carries pathogens between hosts, Airborne transmission - the spread of infectious agents through tiny respiratory droplets that remain suspended in the air and are inhaled, Indirect transmission - spread of infectious agents via contaminated objects, surfaces, air, or foods, Primary prevention - Mass media education, individual education, immunizations, Secondary Prevention - Screening, disease research and tracking, Tertiary Prevention - Prevention of infection spread, providing care and treatment,

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