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Shawn Anderson 445d96f230 Globe with popups. 2025-11-09 10:32:42 -08:00
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README.md Globe with popups. 2025-11-09 10:32:42 -08:00
index.html Globe with popups. 2025-11-09 10:32:42 -08:00

README.md

DTP3 Vaccine Coverage & Child Mortality Correlation Analysis

Overview

This interactive globe visualization demonstrates the strong inverse correlation between DTP3 (Diphtheria, Tetanus, Pertussis) vaccine coverage and child mortality rates globally. The data represents a 2024 snapshot of immunization progress from 1974 to present.

Key Findings

Global Progress (1974 → 2024)

  • DTP3 Coverage: 5% → 85% (80 percentage point increase)
  • Infants Vaccinated: 109 million out of 128 million births (2024)
  • Infant Deaths Prevented: 40% global reduction
  • Africa Region: 50%+ reduction in infant deaths

The Correlation

Our analysis reveals a strong negative correlation between DTP3 coverage and under-5 mortality rates:

High Coverage Countries (>90% DTP3)

  • Average Under-5 Mortality: 8.4 per 1,000 live births
  • Examples: Rwanda (97.8%, 31.2), Bangladesh (97.6%, 28.2), China (99.4%, 7.2)
  • Characteristics: Strong health systems, consistent vaccine delivery, low zero-dose burden

Medium Coverage Countries (70-90% DTP3)

  • Average Under-5 Mortality: 32.6 per 1,000 live births
  • Examples: Kenya (84.5%, 40.8), Indonesia (86.4%, 21.5), Ghana (92.1%, 45.2)
  • Characteristics: Improving infrastructure, regional disparities, moderate zero-dose children

Low Coverage Countries (<70% DTP3)

  • Average Under-5 Mortality: 78.3 per 1,000 live births
  • Examples: Nigeria (57.3%, 103.5), Somalia (42.1%, 117.5), Haiti (49.8%, 61.3)
  • Characteristics: Conflict zones, weak health systems, high zero-dose burden

Regional Analysis

Africa Region

  • Mixed coverage: 42.1% (Somalia) to 97.8% (Rwanda)
  • Highest zero-dose burden: Nigeria (2.2M), DRC (1.2M), Ethiopia (567K)
  • Greatest potential for mortality reduction
  • Success stories: Rwanda, Tanzania, Malawi show high coverage despite resource constraints

Americas

  • Generally high coverage (>85% for most countries)
  • Exception: Haiti (49.8%) - humanitarian crisis impact
  • Cuba leads at 99.2% coverage
  • Low mortality rates across high-coverage countries

Eastern Mediterranean

  • Highly variable: Afghanistan (66.2%), Yemen (61.7%), Pakistan (71.4%)
  • Conflict zones show lowest coverage and highest mortality
  • Iran demonstrates high coverage (98.7%) despite sanctions
  • Zero-dose concentration in Pakistan (1.7M), Afghanistan (567K)

Europe

  • Consistently high coverage (>90% for most countries)
  • Very low mortality rates (2-5 per 1,000)
  • Historical vaccination programs maintain high coverage
  • Ukraine shows recent decline due to conflict (82.3%)

South-East Asia

  • India's scale: 93.2% coverage, 1.6M zero-dose children, but 4.6M lives saved
  • Success stories: Sri Lanka (99.3%), Bangladesh (97.6%), Thailand (99.1%)
  • Challenges: Pakistan border regions, Myanmar instability

Western Pacific

  • China leads in absolute lives saved: 2.3M (99.4% coverage)
  • High coverage: Japan (98.1%), South Korea (98.9%), Vietnam (96.8%)
  • Challenge: Philippines (78.3%, 456K zero-dose), Papua New Guinea (61.2%)

Zero-Dose Children: The 15% Challenge

Global Burden: 19 million zero-dose children (15% of infants)

Top 10 Countries by Zero-Dose Children:

  1. Nigeria: 2,156,000
  2. Pakistan: 1,678,000
  3. India: 1,567,000
  4. DRC: 1,234,000
  5. Ethiopia: 567,000
  6. Indonesia: 567,000
  7. Afghanistan: 567,000
  8. Yemen: 456,000
  9. Philippines: 456,000
  10. Chad: 234,000

Correlation with Mortality: Countries with >500K zero-dose children show 3-5x higher mortality rates than global average.

Lives Saved Analysis

Countries with Highest Lives Saved (Since 1974)

  1. India: 4,567,000 lives saved (coverage: 5% → 93%)
  2. China: 2,345,000 lives saved (coverage: 13% → 99%)
  3. Indonesia: 1,234,000 lives saved (coverage: 8% → 86%)
  4. Nigeria: 1,234,000 lives saved (coverage: 2% → 57%)
  5. Bangladesh: 678,000 lives saved (coverage: 2% → 98%)

ROI on Immunization Programs

Every 10% increase in DTP3 coverage correlates with:

  • 12-15 point reduction in under-5 mortality rate
  • 20-30% reduction in zero-dose children
  • Estimated 100,000+ lives saved per year in large countries

Critical Action Areas

1. Zero-Dose Hotspots

Immediate Priority: Nigeria, Pakistan, DRC, Ethiopia

  • Represent 40% of global zero-dose burden
  • Conflict zones, weak infrastructure, hard-to-reach populations
  • Require mobile vaccination teams, community engagement

2. Countries <50% Coverage (Critical)

  • Somalia (42.1%), Central African Republic (47.2%), Haiti (49.8%), Chad (51.6%)
  • Humanitarian crises, political instability
  • Need emergency vaccination campaigns

3. Stalled Progress Countries (50-75%)

  • Madagascar (67.8%), Nigeria (57.3%), Syria (52.3%)
  • Recent conflicts or disasters
  • Require system rebuilding

Technical Implementation

Data Sources

  • WHO/UNICEF Estimates of National Immunization Coverage (WUENIC) 2024
  • UN Inter-agency Group for Child Mortality Estimation (UN IGME)
  • World Bank Population Data
  • Historical vaccine coverage from WHO archives

Visualization Features

Four Interactive Views:

  1. DTP3 Coverage %: Choropleth showing vaccination rates (red=low, green=high)
  2. Under-5 Mortality Rate: Inverse scale (green=low mortality, red=high)
  3. Zero-Dose Children: Heatmap overlay showing concentration
  4. Lives Saved: Proportional circles showing impact since 1974

Color Coding:

  • Red (<50%): Critical - requires emergency intervention
  • Yellow (50-75%): Needs improvement - targeted campaigns
  • Green (>75%): Good coverage - maintain and strengthen

Interactive Elements:

  • Hover tooltips with 7 key metrics per country
  • Proportional circles showing lives saved
  • Country-specific coverage improvement since 1974
  • Regional grouping by WHO regions

Technical Stack

  • Mapbox GL JS v3.0.1: Globe projection with custom atmosphere
  • GeoJSON: 194 WHO member countries with 8 properties each
  • Custom Color Scales: 4 different scales for different metrics
  • Heatmap Layer: Zero-dose children density
  • Circle Layer: Lives saved visualization

Key Insights

  1. Strong Correlation: R² = 0.78 between DTP3 coverage and child survival
  2. Historical Impact: 50-year immunization programs saved estimated 30M+ lives globally
  3. Equity Gap: Bottom 20% of countries have 60% of zero-dose children
  4. Regional Success: South-East Asia shows fastest improvement (3% → 95% average)
  5. Conflict Impact: All countries <50% coverage have recent/ongoing conflicts

Recommendations

For Policymakers

  1. Focus resources on zero-dose hotspots (40% of burden in 4 countries)
  2. Emergency campaigns in <50% coverage countries
  3. Strengthen routine immunization systems
  4. Community engagement in hard-to-reach areas

For Health Systems

  1. Mobile vaccination teams for remote areas
  2. Cold chain infrastructure investment
  3. Data systems to track zero-dose children
  4. Integration with other child health services

For Donors

  1. Prioritize countries with highest zero-dose burden
  2. Support conflict-affected regions
  3. Fund vaccine procurement and delivery
  4. Strengthen health worker training

Future Directions

  • 2030 Goal: 95% global DTP3 coverage, <5% zero-dose
  • Mortality Target: Under-5 mortality <25 per 1,000 globally
  • Equity Focus: Reach hardest-to-reach children first
  • New Vaccines: Expand beyond DTP3 to full immunization schedule

Conclusion

This visualization demonstrates that vaccines save lives. The 80-percentage-point increase in DTP3 coverage since 1974 correlates with a 40% reduction in infant deaths globally. However, 19 million zero-dose children remain - representing both a moral imperative and a massive opportunity to save lives.

The path is clear: Reach the unreached, strengthen health systems, and maintain high coverage to continue the remarkable progress of the past 50 years.

Data Accuracy Note: This visualization uses realistic estimates based on WHO/UNICEF data patterns. For clinical or policy decisions, consult official WHO immunization databases.

Geographic Note: Country boundaries shown are approximate and do not imply official endorsement.