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training module for medical officers primary health centre - NVBDCP

training module for medical officers primary health centre - NVBDCP

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2.4: EPIDEMIOLOGICAL AND ENTOMOLOGICAL SURVEILLANCEEpidemiological ParametersAnnual Blood smear Examination Rate (ABER)ABER = Number of blood smears examined in a yearTotal populationx 100ABER reflects efficiency and adequacy of case detection. Based on the estimated fever rate in India, aminimum ABER of 10% was fixed under the programme; the blood smear collection should not be lessthan 1% per month during the transmission period. ABER should be equal to fever rate in the locality. Fever rates in the community differ from season to season; hence different targets should be fixed<strong>for</strong> different seasons / months of the year.Ensure that all localities are covered regularly under surveillance, as per prescribed time schedule.If some villages are not covered by surveillance during the transmission season, there is a greatdanger of focal outbreaks.The MO-PHC should Scrutinize the epidemiological data and compare village-wise and <strong>for</strong>tnight-wise targets with actualblood smear collection, positives every month, and every <strong>for</strong>tnight during pre-transmission andtransmission period. Correlate reports of fever incidence or OPD fever attendance from these areas. Become concerned with the situation and take further steps in case of high fever rate or lowcollection of slides. If the blood smear collection is very high and laboratory results show low positivity rates, MO-PHCshould be alert and investigate the efficiency of the laboratory and verify the microscopic diagnosis.Monthly Blood smear Examination Rate (MBER)MBER = Number of blood smears examined in a month x 100Total populationInstead of ABER, monthly blood examination rate should be compared with previous month’sper<strong>for</strong>mance and same corresponding month of the previous year to analyze the trend of fever rates inthe community.Annual Parasite Index (API)API = Total No. of blood smears positive <strong>for</strong> malaria parasite in a year x 1000Total populationAPI depends upon the adequacy of ABER; in areas with low ABER, the significance of API is lost.18

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