surveillance (ser-va´lans)

1. The collection, collation, analysis, and dissemination of data; a type of observational study that involves continuous monitoring of disease occurrence within a population. 2. Ongoing scrutiny, generally using methods distinguished by practicability, uniformity, rapidity, rather than complete accuracy. [Fr. surveiller, to watch over, fr. L. super- + vigilo, to watch] Surveillance does not aim for accuracy or completeness; rather it is designed to provide practical and uniform results in a timely fashion, so that trends can be spotted and appropriate action taken. Such action might include further investigation of some aspect of an unfolding phenomenon, or even intervention. Surveillance is employed frequently in the monitoring of disease or factors influencing disease. The data being analyzed and interpreted may include 1) mortality and morbidity reports based on death certificates, hospital records, or general practice sentinels or notifications; 2) laboratory test results; 3) disease outbreak reports; 4) vaccine utilization-uptake and side effects; 5) reports of work- or school-related absences due to illness; (6) biological changes in known agents, vectors, or reservoirs of disease.
immune s.A theory that the immune system destroys tumor cells which are constantly arising during the life of the individual.immunological s;
immunological s.immune s
post-marketing s.procedure implemented after a drug has been licensed for public use, designed to provide information on use and on occurrence of side effects, adverse effects, etc.


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