2022-07-05-世界卫生组织-Immunization_Namibia_2022_country_profile_18页_375kb

报告摘要

WHO and UNICEF Immunization Coverage Estimates for Namibia (2021 Revision)

This report summarizes the joint estimates of immunization coverage for Namibia, based on data received as of July 7, 2022, for the 2021 revision. The next revision is planned for July 15, 2023. The estimates are country-specific and rely on various data sources, with confidence grades (GoC) reflecting empirical support.

Background

WHO and UNICEF collaborate to assess national immunization coverage by reviewing submitted reports, surveys, administrative data, and expert views. For Namibia, coverage data span multiple vaccines, including BCG, DTP1/DTP3, MCV1/MCV2, Pol3, IPV1, HepB1/HepB3, Hib3, RotaC, and PcV3, with historical trends and potential data biases addressed.

Methodology

Estimates are derived without advanced probability models, so no classical uncertainty measures are provided. The GoC system:

•••: High confidence, supported by strong empirical data.
••: Moderate confidence, supported by at least one data source.
•: Low confidence, limited data with challenges.
For Namibia, many estimates in 2021 rely on data extrapolation or national reports, often lacking direct empirical support.

key Immunization Coverage Estimates for 2021:

BCG: 99% (GoC=No accepted empirical data)
DTP1: 97% (for infants)
DTP3: 93% (Polio-containing equivalent for young children)
Pol3: 92% (Three doses of polio)
IPV1: 76% (inactivated polio vaccine, introduced in 2015)
MCV1: 90% (Measles-containing first dose)
MCV2: 63% (Second dose of measles-containing vaccine)
HepBBirth dose: 86% (Hep B within 24 hours)
HepB3: 93% (Third dose of Hep B)
RotaC: 90% (Recommended rotavirus doses)
PcV3: 78% (Pneumococcal conjugate third dose)

Historical data show fluctuations, often due to factors like vaccine stock-outs, census adjustments, or outdated reports, with many estimates challenged or lacking confidence.

Data Quality and Sources

Estimates use reported administrative data, surveys (e.g., Namibia Demographic and Health Surveys), and global databases. Challenges include potential biases, data inconsistencies, and the need for high-quality surveys to confirm coverage levels. Surveys like the 2011-2013 Demographic and Health Surveys provided supporting evidence but were often disputed.

Data Use Caution

All estimates should be used with care, as data quality varies. The GoC and challenges highlight potential inaccuracies; always consider the purpose and context of use.