From: An evaluation of the Zambia influenza sentinel surveillance system, 2011–2017
Indicator | Calculation/data inputs | Data source | Indicator value | Score |
---|---|---|---|---|
Data quality and completeness | ||||
• Proportion of enrolled patients with ILI against set target (5 patients per week per site). | Number of enrolled patients with ILI / Estimated target. | ISS database and estimated target | 140.4% | 3 |
• Proportion of enrolled patients with SARI against set target (all eligible patients). | Number of enrolled patients with SARI / All patients with SARI. | ISS database | 69.8% | 2 |
• Proportion of SARI/ILI cases that meet the case definition | Number of ILI/SARI cases that meet the case definition / Total number of enrolled ILI/SARI cases | ISS database | 86.5% | 3 |
• Proportion of forms without at least one inconsistent or missing value for key variablesb | Number of forms without at least one incorrect or missing value / Total number of forms | ISS database | 93.8% | 3 |
• Proportion of sampled ILI/SARI cases with available laboratory results | Number of ILI/SARI cases with available laboratory results / Number of sampled ILI/SARI cases | ISS database | 93.2% | 3 |
• Proportion of sample with positive RNP results | Number of samples with a positive RNP result / Total number of samples tested | ISS database | 99.8% | 3 |
• Proportion of collected variables included in the WHO recommended minimum data collection standard | Number of collected variables within the WHO list / Number of WHO recommended variables. | CIF and WHO guidelines for influenza sentinel surveillance. | 82.3% | 3 |
Timeliness | ||||
• Proportion of samples received within the target period from collectionc | Number of samples received at the laboratory within 14 days from collection / Number of samples received | ISS database | 73.2% | 2 |
• Proportion of samples tested within one week from receipt | Number of samples tested within two weeks from receipt / Number of samples tested | ISS database | 87.3% | 3 |
Representativeness | ||||
• Geographical coverage | Number of provinces covered by the influenza sentinel surveillance network / Total number of provinces of the country | Geographic distribution of sentinel sites. | 20.0% | 1 |
• Inclusion of all age groups | Age distribution of ILI/SARI cases (median, minimum and maximum) | ISS database | Med.: 4 Y | 3 |
Min.: 0 Y | ||||
Max.: 97 Y | ||||
Flexibility | ||||
• Expansion of sentinel sites participating to the ISSS since inception | Number of new sentinel sites since inception | Protocol | 5 | 3 |
• Surveillance for pathogens other than influenza | Number of investigated pathogens other than influenza | Protocol | 10 | 3 |