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Data surveilans pasif datang dari kegiatan-kegiatan yang dilakukan dengan tujuan untuk hal lain selain dari surveilans. Surveilans aktif terdiri dari surveillance consists of activities that are conducted for the purpose of obtaining surveillance data. Passive surveillance data can be very useful, and is usually quite inexpensive compared to the cost of active surveillance. Data from laboratory submissions from disease investigations is passive surveillance data. Analysis of the information accompanying a laboratory submission along with the investigation results can form an important part of a country’s animal health surveillance system. If information about the signs or syndrome affecting the animals is collected, analysis of these data for trends and patterns can be performed, and this is called syndromic surveillance. Syndromic surveillance is very useful for early warning of the incursion of important diseases that we do not have, and is also good for providing evidence of absence of important diseases.