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More specifically, infectivity is the extent to which the pathogen can enter, survive, and multiply in a host. It is measured by the ratio of the number of people who become infected to the total number exposed to the pathogen. [1] Infectivity has been shown to positively correlate with virulence, in plants. This means that as a pathogen's ...
Intervention mapping [1] is a protocol for developing theory-based and evidence-based health promotion programs. Intervention Mapping describes the process of health promotion program planning in six steps: the needs assessment based on the PRECEDE-PROCEED model
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.
Graph of herd immunity threshold vs basic reproduction number with selected diseases. S will be (1 − q), since q is the proportion of the population that is immune and q + S must equal one (since in this simplified model, everyone is either susceptible or immune). Then:
The relationship between the latent period, the infectious period (the period of communicability) and the incubation period.In some diseases, as depicted in this diagram, the latent period is shorter than the incubation period.
Pathogenicity is the potential disease-causing capacity of pathogens, involving a combination of infectivity (pathogen's ability to infect hosts) and virulence (severity of host disease). Koch's postulates are used to establish causal relationships between microbial pathogens and diseases.
Common issues that are the subject of public health interventions include obesity, [3] drug, tobacco, and alcohol use, [4] and the spread of infectious disease, e.g. HIV. [5] A policy may meet the criteria of a public health intervention if it prevents disease on both the individual and community level and has a positive impact on public health ...
Workplace health promotion is the combined efforts of employers, employees, and society to improve the mental and physical health and well-being of people at work. [1] The term workplace health promotion denotes a comprehensive analysis and design of human and organizational work levels with the strategic aim of developing and improving health resources in an enterprise.