Infectious disease and vaccination center
One evidence packet. Four biomedical lenses. Decide what the data support, explain what measles changes inside immune memory, choose a proportionate intervention, and repair a chart that says more than its sources can prove.
You are on a biomedical evidence team preparing a school-community briefing. A supplied chart appears to connect falling vaccination coverage with rising measles cases. Your job is to check the numbers, explain the biology, choose a proportionate intervention, and rebuild the display so it says only what the evidence supports.
CDC reports 2,288 confirmed U.S. measles cases for 2025. Twelve percent were hospitalized, and three confirmed deaths were reported.
Evidence limit: CDC still marks the 2025 count as preliminary and subject to change. This is a national total, not a local risk estimate.
CDC: Measles Cases and Outbreaks
National kindergarten MMR coverage decreased from 95.2% in 2019-2020 to 92.5% in 2024-2025.
Evidence limit: These values describe U.S. kindergarteners by school year. They do not describe every age group or every community.
CDC SchoolVaxView
CDC reports that one MMR dose is 93% effective and two doses are 97% effective at preventing measles.
Evidence limit: Effectiveness is a population estimate. It does not promise that every vaccinated person is protected in every exposure.
CDC: Measles Cases and Outbreaks
CDC estimates about one encephalitis case and two to three deaths per 1,000 reported cases. SSPE was estimated at 7 to 11 cases per 100,000 measles cases in the 1989-1991 U.S. resurgence.
Evidence limit: These are historical population estimates. They do not predict the outcome for one person.
CDC Surveillance Manual, Chapter 7
In one study, Mina and colleagues followed 77 unvaccinated children before and two months after natural measles infection. Across individuals, 11% to 73% of the measured preexisting antibody repertoire was lost. The MMR-vaccinated comparison group did not show the same loss.
Evidence limit: The range varied across individuals. The study supports loss of humoral immune memory, but it does not establish the duration of every child's increased susceptibility.
Mina et al., Science (2019), PMID 31672891
The supplied figure labels 2025 as 2,289 cases. Current CDC reporting gives 2,288. Its vaccination line does not identify the measured population or a source.
Evidence limit: A dual-axis figure with mismatched populations and time bases can suggest a causal relationship the data do not prove.
Comparison of the supplied figure with current CDC reporting
Confirmed cases reported to CDC. The 2025 value remains preliminary.
Source: CDC Measles Cases and Outbreaks. The selected years support comparison, not a complete time-series model.
These percentages describe kindergarteners by school year.
Read the values, not just the bar length. The scale begins at 0%, so the display does not magnify a 2.7 percentage-point change.
Source: CDC SchoolVaxView. Do not treat this age-specific national average as every community's coverage.
What the pair supports
The displays show a recent decrease in national kindergarten MMR coverage and a high 2025 national case count. They do not prove that the first caused the second. Local coverage, imported infections, contact patterns, outbreak clustering, and surveillance all matter.
Observation, pattern, and justified claims
Decide which claim is strongest: (A) measles cases rose while kindergarten coverage fell, (B) the national coverage change caused the 2025 outbreaks, or (C) MMR stopped working. Defend your choice with E1, E2, E3, and E6.
The evidence supports ___ because E__ shows ___. It does not prove ___ because ___.
Required evidence: E1, E2, E3, E6
Claim A is supported as a time pattern. Claims B and C exceed the evidence. The two national series use different populations and time bases, and E3 still reports high vaccine effectiveness.
Course claim ceiling: Describe an association or pattern. Do not claim that the national coverage change caused a specific outbreak.
Write a three-part response using at least two evidence IDs.
State one conclusion that fits the evidence.
Cite two evidence IDs and name the relevant values or findings.
Name one conclusion the packet cannot support.
Evidence checked August 11, 2026. CDC continues to mark 2025 surveillance counts as preliminary. Go Hornets.
