2023-07-16-世界卫生组织-Immunization_Mongolia_2023_country_profile_20页_375kb

Mongolia: WHO/UNICEF Immunization Coverage Summary (2011-2022)

Background

• WHO and UNICEF estimates cover 12 key vaccines (BCG, DTP, HepB, Hib, MCV/MCV2, Pol3, etc.), relying on reported data, surveys, and empirical adjustments.
• Estimates acknowledge data quality variations but use available evidence.

Key Findings by Vaccine

1. BCG

   • Average Coverage: ~99% consistently since 2011.
   • No reported dips pre-COVID, maintained high vaccination rates.

2. DTP3 (Diphtheria/Tetanus/Pertussis 3rd Dose)

   • Average Coverage: 99% consistently.
   • Stability despite COVID disruptions—attributed to reliable reporting and administrative data.

3. MCV1/MCV2 (Measles Containing Vaccine)

   • Average Coverage: 98-99%.
   • Minor variations (e.g., ~98% from 2017) but overall robust, with survey checks added confidence.

4. HepB Birth Dose

   • Average Coverage: 98%.
   • Sustained post-2010. No significant changes linked to COVID.

5. Pol3 (3rd Dose of Polio Vaccine)

   • Average Coverage: Consistently high until a ~96% drop in 2021, rebounding to 99% in 2022.
   • Decline attributed to COVID disruptions, data adjustments noted.

Prevalent Challenges: COVID Impact

• Unexplained Decreases: Many vaccines saw a 10% reduction in target population from 2020-2021 due to COVID-19 disruptions.
• Rationale: WHO/UNICEF attributed this to reporting disruptions in vaccination centers.

Survey Validation

• Mongolia MICS/Surveys (2013-2018) adjusted estimates by correcting recall bias.
• These surveys increased confidence (GoC•••) for some vaccines like MCV and DTP through empirical support.

Contextual Notes

• Grade of Confidence (GoC) indicates data reliability, not quality.
• Cover Trends: Mongolia boasts near universal immunization rates, with most vaccines averaging over 98% without deviations post-2019.
• Limitations: High reliance on self-reported administrative data, susceptible to recall/reflection bias.

Disclaimers

• Estimates are subjectively graded; confidence in "high" ranges (GoC••• or ••) indicates empirical support, not judgment on data quality.
• Trends worth monitoring: CV-related coverage drops and HepB birth dose consistency.

Source: WHO/UNICEF Immunization Coverage Estimates, July 2023.