population at risk

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population at risk

a group of people who share a characteristic that causes each member to be susceptible to a particular event, such as nonimmunized children who are exposed to poliovirus or immunosuppressed people who are exposed to herpesvirus. Also called vulnerable population.


all of the animals in a specifically defined area considered as a whole. The population may also be defined in modes other than geography, e.g. the cow population, a species specification, the nocturnal bird population.

binomial population
see binomial population.
population cartogram
a map of populations.
case population
see case population.
closed population
e.g. closed herd or flock; a population into which no introductions are permitted, including artificial insemination or embryo transfer; the population is genetically and/or hygienically isolated.
comparison population
see comparison population.
contiguous p's
the populations are separated but have a common border. Some diseases are very difficult to restrain from spreading from one population to the next.
control population
see control population.
population density
see population density.
experimental population
the population in which the experiment, or trial, is being conducted.
finite population
one capable of total examination by census.
genetic population
see deme.
genetically defined population
one in which the ancestry of the animals in it is known.
population genetics
deals with the frequency of occurrence of inherited characteristics in a population.
infinite population
cannot be examined as a total population because they may never actually exist but are capable of statistical importance.
population limitation
restricting the growth of an animal population by desexing, by culling or by managemental means of interfering with reproduction.
population mean
the mean of the population.
population numbers
see population size (below).
open population
one in which immigration in and out is unrestrained.
parent population
the original population about which it is hoped to make some inferences by examination of a sample of its constituent members.
population proportion
the percentage of the population that has the subject characteristics.
population pyramid
a graphic presentation of the composition of a population with the largest group forming the baseline, the smallest at the apex.
population at risk
see risk population (below).
risk population
the population which is composed of animals that are exposed to the pathogenic agent under discussion and are inherently susceptible to it. Called also population at risk. High or special risk groups are those which have had more than average exposure to the pathogenic agent.
population size
actual counting of a total population, the census method, is not often possible in large animal populations. Alternatives are by various sampling techniques including area trapping, the trapping of all animals in an area, the capture-release-recapture method, the nearest neighbor and line transect methods,
The population size is expressed as the population present at a particular instant. Alternatively it can be expressed as an animal-duration expression when the population is a shifting one and it is desired to express the population size over a period (e.g. cow-day).
stable population
a population which has constant mortality and fertility rates, and no migration, therefore a fixed age distribution and constant growth rate.
target population
in epidemiological terms the population from which an experimenter wishes to draw an unbiased sample and make inferences about it.
References in periodicals archive ?
Although the FTA indicates that climate change could reduce the total population at risk of water shortage, there are many measures that would help societies cope with present and future water stress regardless of their causes.
The population at risk in the DRC has been estimated at 12,600,000 persons (PNLTHA, unpub, data).
Score Equations 5 and 10 suggest that if the population-average baseline hazard function times the average effect of individual-level covariates on survival for the population at risk, [THETA](t), and the population average baseline mortality, [PHI](t), are both modeled using the same unknown function of time, then our modeling approaches to the dynamic cohort and time-series designs provide identical estimates of the effects of environmental covariates.
This would imply that the level of stress imposed by ambient PM is low or that the population at risk is small.
To change the chronic course of disease, treatment must be specifically directed at the responsible agent and applied to the appropriate stage of pathogenesis in the population at risk.
Witzig summarized the safety results of four clinical trials which showed that ZEVALIN is very well tolerated, even in a refractory population at risk for toxicity.
Planned, but not yet scheduled, are maps in the San Francisco bay region where there is high population at risk from local faults.
Studies done so far indicate that NXC4720 is a very promising candidate for preventive use against this dreaded pathogen in animals, meat processing plants and other contaminated sources, as well as in the population at risk in the event of an outbreak," said Dr.
It is estimated that the population at risk in China, Hong Kong, Taiwan, Singapore, South Korea, Malaysia, Indonesia, Thailand, the Philippines and Vietnam totals almost 1.
International use of biochemical bone markers as aids in medical practice has increased due to the large population at risk for bone diseases -- nearly 200 million people worldwide.

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