Data & Trends — School Health Matters

About This Data: All statistics on this page are sourced from the CDC, WHO, AAP, and peer-reviewed public health research. Charts visualize data from these authoritative sources. Click Enable Editing (bottom-right) to rewrite any text in your own words.

Overview

The Scale of the Problem

Communicable diseases in schools represent a major public health burden, affecting millions of students and school days every year.

22M+ School days lost to influenza annually in the U.S. (CDC)

59% Of illness-related school closures are caused by respiratory illness (CDC IPC Brief)

20% Of school closures caused by gastrointestinal illness, primarily norovirus (CDC)

74% Lower infection risk with improved classroom ventilation (CDC IPC Science Brief)

90%+ Of pre-K & elementary students affected by respiratory virus detections annually (AAP 2025)

Attendance Impact

School Days Lost by Disease

Estimated annual school days lost in the United States attributed to each of the six communicable diseases covered in this project, based on CDC and AAP surveillance data.

Estimated Annual School Days Lost per Disease

Sources: CDC Influenza Surveillance, CDC Norovirus, AAP Pediatrics. Values represent U.S. estimates and vary by season.

What Works

Estimated Disease Reduction by Intervention

Evidence-based interventions can dramatically reduce the spread of communicable diseases in school settings. These estimates are drawn from AAP, CDC, and peer-reviewed studies.

Hand Hygiene Impact

An AAP study found schools with structured hand-washing programs experienced significantly fewer illness-related absences. Source: AAP Grand Rounds — "Hand Hygiene in Schools Reduces Influenza and Absenteeism"

Overall illness-related absences reduced 21%

Gastrointestinal illness absences reduced 40%

Respiratory illness absences reduced 30%

Vaccination Coverage Impact

Countywide school-based flu vaccination was linked to significant reductions in student absences and prevention of pediatric flu deaths. Sources: AAP Pediatrics (Davis et al., 2008); CDC Flu in Children.

Reduction in student flu absences (school-based vaccination program) 72%

Pediatric flu deaths prevented among vaccinated children ~80%

Herd immunity threshold for seasonal flu (estimated vaccination coverage needed) 50–70%

Broader Impact

Why School Disease Data Matters

Education at Risk

Chronic absenteeism — missing more than 10% of school days — is linked to poor academic outcomes and long-term health disparities. Source: AAP Pediatrics, 2019.

Healthcare Burden

Flu-related hospitalizations in children under 5 range from 6,000 to 25,000 per season. RSV is the #1 cause of infant hospitalization nationally. Source: CDC.

Economic Impact

Student illness causes parents to miss work and school closures create economic strain on families and communities that rely on in-person services.

Prevention Works

Layered, multicomponent approaches — vaccination, hand hygiene, ventilation, and illness-exclusion policies — are the most effective evidence-based interventions. Source: CDC, 2023.

Community Protection

Schools can act as community health amplifiers and platforms for public-health education and vaccination outreach.

Health Equity

Federal civil-rights laws require schools to provide accommodations during illness outbreaks to ensure equal learning access for students with disabilities.