Active surveillance

Active surveillance is the deliberate search for target data. This has been used particularly in malaria control programmes, where contacts of malaria cases are visited and blood slides taken, as illustrated in Fig. 4.1.

Fig. 4.1. An active case detection (ACD) technician taking a blood slide from a woman suffering from fever in a malaria eradication programme (St Isabel, Solomon Islands)

Another example is a leprosy field worker who visits all the villages in his/her area and examines the population for any signs of early disease. Suspect cases are then sent to clinic or hospital for further tests.

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