2022-07-05-世界卫生组织-Immunization_United_Republic_of_Tanzania_2022_country_profile_19页_402kb

WHO and UNICEF provide immunization coverage estimates for United Republic of Tanzania by vaccine type and year. Key estimates include:

• BCG: Coverage consistently high (91-99%) before 2015, with fluctuations due to stock-outs and calibration.
• DTP1/DTP3: Estimated coverage varies yearly (75-99%), influenced by data calibration, stock-outs, and survey integration.
• Polio: Shows high coverage (73-97%) before 2019, with dips in 2018-2020.
• HepB/HepB3: Decreased in 2021 (76-97%), previously high (e.g., 97% in 2014).
• MCV/MCV2: Coverage varies from 74-98%, showing challenges post-vaccine introduction.
• IPV: Introduced in 2018, with lower estimates (56-89%) compared to other vaccines.
• PcV3/Hib: Varies between 76-95%, affected by data gaps.
• RotaC: Higher estimates (86-90%) generally, but factors like recall bias applied.

Estimates incorporate data from multiple sources including administrative reports, surveys, and program data. Challenges include vaccine stock-outs and discrepancies between reported and survey data. Coverage in 2021 remains provisional due to pending survey results.