2022-07-05-世界卫生组织-Immunization_Cabo_Verde_2022_country_profile_17页_362kb

WHO and UNICEF National Immunization Coverage Estimates Summary

Core Content

WHO and UNICEF jointly estimate national immunization coverage levels by reviewing data from Member States, including administrative, official, and survey-based sources. These estimates are designed to reflect the most likely coverage levels, taking into account potential biases and expert opinions. The methodology involves analyzing empirical data, recalculating coverage with independent denominators, and incorporating survey evidence where available. The estimates are not based on ad hoc adjustments but rather on a systematic review of data sources.

Key Immunization Coverage Indicators

• BCG: Percentage of births who received one dose of Bacillus Calmette Guerin vaccine.
• DTP1 / DTP3: Percentage of surviving infants who received the 1st / 3rd dose of diphtheria and tetanus toxoid with pertussis containing vaccine.
• Pol3: Percentage of surviving infants who received the 3rd dose of polio containing vaccine (either oral or inactivated).
• IPV1: Percentage of surviving infants who received at least one dose of inactivated polio vaccine (IPV).
• MCV1 / MCV2: Percentage of surviving infants who received the 1st and 2nd dose of measles containing vaccine (MCV), respectively.
• RCV1: Percentage of surviving infants who received the 1st dose of rubella containing vaccine, based on the first measles-rubella combination vaccine.
• HepBB: Percentage of births who received a dose of hepatitis B vaccine within 24 hours of delivery.
• HepB3: Percentage of surviving infants who received the 3rd dose of hepatitis B vaccine.
• Hib3: Percentage of surviving infants who received the 3rd dose of Haemophilus influenzae type b vaccine.
• RotaC: Percentage of surviving infants who received the final recommended dose of rotavirus vaccine.
• PcV3: Percentage of surviving infants who received the 3rd dose of pneumococcal conjugate vaccine.
• YFV: Percentage of surviving infants who received one dose of yellow fever vaccine.

Grade of Confidence (GoC)

The GoC is a measure of the empirical support for the estimates and not a judgment on the data quality. It is based on the availability of data sources:

• [R + ]: Supported by reported data.
• [D + ]: Supported by independent denominator from World Population Prospects.
• [S + ]: Supported by at least one survey within 2 years.
• [R-], [D-], [S-]: Data sources challenge the estimate.

Coverage Estimates by Year

Notes on Data Sources and Challenges

• Administrative Data: Reported by national authorities based on aggregated data from health service providers. May be biased due to inaccurate numerator or denominator data.
• Official Data: Estimated coverage based on national authorities' assessments, which may include administrative, survey, or other data sources.
• Survey Data: Based on population-based household surveys among children aged 12-23 months or 24-35 months, using vaccination history or caregiver recall. Surveys are used to support estimates and are considered for the appropriate birth cohort.
• Extrapolation and Adjustments: In cases where data are missing or inconsistent, WHO and UNICEF may use extrapolation from previous years or interpolate data from earlier and later years.
• Data Quality Issues: In some years, reported data exceeded 100%, leading to exclusion. For example, 2021 data were excluded due to sudden increases and potential inaccuracies, with a recommendation for a high-quality survey.

Recommendations

• For years with low GoC (e.g., 2021), WHO and UNICEF recommend a critical review of the data and suggest conducting high-quality surveys to confirm coverage levels.
• The estimates should be used with caution, as they may be affected by biases and inaccuracies in data sources.
• The GoC is not a subjective measure of data quality but reflects the empirical support for the estimates.

Disclaimer

The WHO and UNICEF estimates are based on varying and sometimes unknown quality data. While efforts are made to ensure accuracy, no warranty is provided for the data or its use. Users are advised to interpret and use the data in light of their specific objectives.