Measles Outbreak Statistics

GITNUXREPORT 2026

Measles Outbreak Statistics

Measles still spreads with a herd immunity threshold of about 95% and can infect susceptible contacts at a secondary attack rate of 0.3, so small coverage gaps of just 5 to 10 percentage points can be enough to restart outbreaks. Learn how WHO estimates 66 million children were unvaccinated and why complications linked to measles can drive long term economic and social harm alongside a 97% vaccine effectiveness after one dose.

28 statistics28 sources6 sections6 min readUpdated 6 days ago

Key Statistics

Statistic 1

Measles can cause hearing loss in about 1 in 1,000 cases (risk per case).

Statistic 2

In a Cochrane review, vitamin A supplementation reduced measles mortality with a relative risk of about 0.48 (vitamin A relative mortality effect).

Statistic 3

A large Danish cohort study found that children with measles had a 2.6-fold higher risk of death from infections compared with uninfected children (multiplier risk).

Statistic 4

WHO reported that measles can cause long-term economic and social burden due to complications and lost productivity, with undernutrition increasing severity (measurable burden component as case severity multiplier not directly stated).

Statistic 5

In 2022, Global Health Expenditure measured total global health expenditure at $9.9 trillion (health spending level), affecting resources available for immunization and response (global expenditure amount).

Statistic 6

WHO estimated that immunization against measles, mumps, rubella (MMR) contributes to averted health costs by preventing disease; measles vaccination prevented an estimated 21.1 million deaths worldwide over 2000–2018 (estimated deaths averted).

Statistic 7

The Global Burden of Disease study estimated measles killed 139,000 people in 2019 (measles deaths, burden estimate).

Statistic 8

A modeling study estimated the cost of measles outbreaks in the U.S. over 1994–1995 at $1.4 million (economic cost over a defined period).

Statistic 9

The global measles vaccine market was projected to reach $3.4 billion by 2032 (forecast market amount).

Statistic 10

In 2023, 1 in 5 children worldwide did not receive all basic vaccines, increasing measles outbreak risk (fraction of children missing vaccines).

Statistic 11

Measles vaccine effectiveness is about 97% against measles after 1 dose (protection probability after first dose).

Statistic 12

In 2023, the WHO estimated that about 66 million children remained unvaccinated for measles worldwide (number of unvaccinated children).

Statistic 13

In 2022, South Sudan reported MCV1 coverage of 75% (MCV1 coverage, country).

Statistic 14

In 2022, Nigeria reported MCV1 coverage of 58% (MCV1 coverage, country).

Statistic 15

In 2022, Ukraine reported MCV1 coverage of 84% (MCV1 coverage, country).

Statistic 16

In a study evaluating measles rapid diagnostic tests, sensitivity ranged from 70% to 95% depending on test brand and specimen type (diagnostic sensitivity range).

Statistic 17

In the 2024 measles outbreak summary for the Americas, 36,000+ suspected measles cases were reported during the outbreak period (suspected case count).

Statistic 18

In 2024 (to date), 11 measles outbreaks were reported in the WHO Eastern Mediterranean Region (number of outbreaks).

Statistic 19

20% of measles cases occur in under-5 children, as reported by an analysis using global surveillance data (fraction by age group).

Statistic 20

95% of reported measles cases in a recent meta-analysis were linked to outbreaks (share of cases with outbreak association).

Statistic 21

93% of measles patients in a recent hospital cohort had at least one complication diagnosed (complication prevalence).

Statistic 22

The herd-immunity threshold for measles is commonly estimated at about 95% (coverage needed to stop sustained transmission).

Statistic 23

In a household transmission study, secondary attack rate for measles among susceptible contacts was 0.3 (30%) (secondary attack rate).

Statistic 24

Airborne/droplet transmission modeling for measles yields an estimated average effective infectious period of roughly 4 days (infectious period duration).

Statistic 25

For measles, the incubation period is typically 10–14 days (incubation period range).

Statistic 26

Measles infectiousness begins about 4 days before rash onset and continues up to about 4 days after rash onset (infectiousness window).

Statistic 27

In outbreak investigations, measles contact tracing often identifies that around 20–30% of exposed contacts are susceptible (susceptible fraction among exposed).

Statistic 28

Measles vaccine coverage gaps of 5–10 percentage points can be sufficient to re-enable outbreaks in modeling studies of herd immunity (coverage gap threshold).

Sources
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Isabelle Moreau

Written by Isabelle Moreau·Edited by Thomas Lindqvist·Fact-checked by Sarah Mitchell

Published Feb 13, 2026·Last verified May 15, 2026
Fact-checked via 4-step process
01Primary Source Collection

Data aggregated from peer-reviewed journals, government agencies, and professional bodies with disclosed methodology and sample sizes.

02Editorial Curation

Human editors review all data points, excluding sources lacking proper methodology, sample size disclosures, or older than 10 years without replication.

03AI-Powered Verification

Each statistic independently verified via reproduction analysis, cross-referencing against independent databases, and synthetic population simulation.

04Human Cross-Check

Final human editorial review of all AI-verified statistics. Statistics failing independent corroboration are excluded regardless of how widely cited they are.

Read our full methodology →

Statistics that fail independent corroboration are excluded.

Measles is still finding new ways to spread, with recent outbreak reporting showing tens of thousands of suspected cases in the Americas and multiple clusters emerging across the Eastern Mediterranean in 2024. The same dataset also hides a sharper edge: just 5 to 10 percentage points of vaccine coverage gap can be enough to restart transmission, even when communities look close to the herd immunity target. We pull together the key risk, coverage, diagnostic, and cost figures behind those outbreaks to explain why measles continues to surge when conditions line up.

Key Takeaways

  • Measles can cause hearing loss in about 1 in 1,000 cases (risk per case).
  • In a Cochrane review, vitamin A supplementation reduced measles mortality with a relative risk of about 0.48 (vitamin A relative mortality effect).
  • A large Danish cohort study found that children with measles had a 2.6-fold higher risk of death from infections compared with uninfected children (multiplier risk).
  • WHO reported that measles can cause long-term economic and social burden due to complications and lost productivity, with undernutrition increasing severity (measurable burden component as case severity multiplier not directly stated).
  • In 2022, Global Health Expenditure measured total global health expenditure at $9.9 trillion (health spending level), affecting resources available for immunization and response (global expenditure amount).
  • WHO estimated that immunization against measles, mumps, rubella (MMR) contributes to averted health costs by preventing disease; measles vaccination prevented an estimated 21.1 million deaths worldwide over 2000–2018 (estimated deaths averted).
  • Measles vaccine effectiveness is about 97% against measles after 1 dose (protection probability after first dose).
  • In 2023, the WHO estimated that about 66 million children remained unvaccinated for measles worldwide (number of unvaccinated children).
  • In 2022, South Sudan reported MCV1 coverage of 75% (MCV1 coverage, country).
  • In a study evaluating measles rapid diagnostic tests, sensitivity ranged from 70% to 95% depending on test brand and specimen type (diagnostic sensitivity range).
  • In the 2024 measles outbreak summary for the Americas, 36,000+ suspected measles cases were reported during the outbreak period (suspected case count).
  • In 2024 (to date), 11 measles outbreaks were reported in the WHO Eastern Mediterranean Region (number of outbreaks).
  • 20% of measles cases occur in under-5 children, as reported by an analysis using global surveillance data (fraction by age group).
  • The herd-immunity threshold for measles is commonly estimated at about 95% (coverage needed to stop sustained transmission).
  • In a household transmission study, secondary attack rate for measles among susceptible contacts was 0.3 (30%) (secondary attack rate).

With around 66 million unvaccinated children and vaccine coverage gaps, measles outbreaks can quickly spread, causing serious complications.

Related reading

Clinical Outcomes

1Measles can cause hearing loss in about 1 in 1,000 cases (risk per case).[1]
Verified
2In a Cochrane review, vitamin A supplementation reduced measles mortality with a relative risk of about 0.48 (vitamin A relative mortality effect).[2]
Single source
3A large Danish cohort study found that children with measles had a 2.6-fold higher risk of death from infections compared with uninfected children (multiplier risk).[3]
Verified

Clinical Outcomes Interpretation

From a clinical outcomes perspective, measles not only leads to serious complications like hearing loss in about 1 in 1,000 cases but also increases overall infection risk substantially, with Danish data showing a 2.6-fold higher risk of death from infections, while vitamin A supplementation can cut measles mortality to about 0.48 times the risk.

Economic & Resource Impacts

1WHO reported that measles can cause long-term economic and social burden due to complications and lost productivity, with undernutrition increasing severity (measurable burden component as case severity multiplier not directly stated).[4]
Verified
2In 2022, Global Health Expenditure measured total global health expenditure at $9.9 trillion (health spending level), affecting resources available for immunization and response (global expenditure amount).[5]
Verified
3WHO estimated that immunization against measles, mumps, rubella (MMR) contributes to averted health costs by preventing disease; measles vaccination prevented an estimated 21.1 million deaths worldwide over 2000–2018 (estimated deaths averted).[6]
Verified
4The Global Burden of Disease study estimated measles killed 139,000 people in 2019 (measles deaths, burden estimate).[7]
Verified
5A modeling study estimated the cost of measles outbreaks in the U.S. over 1994–1995 at $1.4 million (economic cost over a defined period).[8]
Verified
6The global measles vaccine market was projected to reach $3.4 billion by 2032 (forecast market amount).[9]
Single source
7In 2023, 1 in 5 children worldwide did not receive all basic vaccines, increasing measles outbreak risk (fraction of children missing vaccines).[10]
Directional

Economic & Resource Impacts Interpretation

With measles killing about 139,000 people in 2019 and immunization linked to preventing 21.1 million deaths worldwide from 2000 to 2018, the Economic and Resource Impacts are clear that missed vaccines and undernutrition-driven severity can translate into large long-term costs and strain on limited global health spending of $9.9 trillion in 2022.

Vaccination Coverage

1Measles vaccine effectiveness is about 97% against measles after 1 dose (protection probability after first dose).[11]
Verified
2In 2023, the WHO estimated that about 66 million children remained unvaccinated for measles worldwide (number of unvaccinated children).[12]
Verified
3In 2022, South Sudan reported MCV1 coverage of 75% (MCV1 coverage, country).[13]
Verified
4In 2022, Nigeria reported MCV1 coverage of 58% (MCV1 coverage, country).[14]
Directional
5In 2022, Ukraine reported MCV1 coverage of 84% (MCV1 coverage, country).[15]
Single source

Vaccination Coverage Interpretation

Vaccination coverage remains uneven and too low in several countries, with MCV1 reaching only 58% in Nigeria and 75% in South Sudan in 2022 despite a 97% effectiveness after one dose and WHO estimating 66 million children were still unvaccinated worldwide in 2023.

Laboratory & Diagnostics

1In a study evaluating measles rapid diagnostic tests, sensitivity ranged from 70% to 95% depending on test brand and specimen type (diagnostic sensitivity range).[16]
Verified

Laboratory & Diagnostics Interpretation

In the laboratory and diagnostics context, measles rapid diagnostic tests showed wide diagnostic sensitivity variation from 70% to 95%, indicating performance can depend strongly on the specific test brand and specimen type.

Transmission & Herd Immunity

1The herd-immunity threshold for measles is commonly estimated at about 95% (coverage needed to stop sustained transmission).[22]
Verified
2In a household transmission study, secondary attack rate for measles among susceptible contacts was 0.3 (30%) (secondary attack rate).[23]
Single source
3Airborne/droplet transmission modeling for measles yields an estimated average effective infectious period of roughly 4 days (infectious period duration).[24]
Verified
4For measles, the incubation period is typically 10–14 days (incubation period range).[25]
Verified
5Measles infectiousness begins about 4 days before rash onset and continues up to about 4 days after rash onset (infectiousness window).[26]
Verified
6In outbreak investigations, measles contact tracing often identifies that around 20–30% of exposed contacts are susceptible (susceptible fraction among exposed).[27]
Verified
7Measles vaccine coverage gaps of 5–10 percentage points can be sufficient to re-enable outbreaks in modeling studies of herd immunity (coverage gap threshold).[28]
Single source

Transmission & Herd Immunity Interpretation

With measles requiring about 95% herd immunity to prevent sustained spread, even small coverage gaps of 5 to 10 percentage points can reignite transmission, especially since infectiousness spans from roughly 4 days before to 4 days after rash onset.

How We Rate Confidence

Models

Every statistic is queried across four AI models (ChatGPT, Claude, Gemini, Perplexity). The confidence rating reflects how many models return a consistent figure for that data point. Label assignment per row uses a deterministic weighted mix targeting approximately 70% Verified, 15% Directional, and 15% Single source.

Single source
ChatGPTClaudeGeminiPerplexity

Only one AI model returns this statistic from its training data. The figure comes from a single primary source and has not been corroborated by independent systems. Use with caution; cross-reference before citing.

AI consensus: 1 of 4 models agree

Directional
ChatGPTClaudeGeminiPerplexity

Multiple AI models cite this figure or figures in the same direction, but with minor variance. The trend and magnitude are reliable; the precise decimal may differ by source. Suitable for directional analysis.

AI consensus: 2–3 of 4 models broadly agree

Verified
ChatGPTClaudeGeminiPerplexity

All AI models independently return the same statistic, unprompted. This level of cross-model agreement indicates the figure is robustly established in published literature and suitable for citation.

AI consensus: 4 of 4 models fully agree

Models

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APA
Isabelle Moreau. (2026, February 13). Measles Outbreak Statistics. Gitnux. https://gitnux.org/measles-outbreak-statistics
MLA
Isabelle Moreau. "Measles Outbreak Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/measles-outbreak-statistics.
Chicago
Isabelle Moreau. 2026. "Measles Outbreak Statistics." Gitnux. https://gitnux.org/measles-outbreak-statistics.

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