Fatal enhanced respiratory syncytial virus disease in toddlers.
Level 4 - case-series / case-control
Retrospective case series and pathological/transcriptomic characterization of two historical autopsy cases
PubMed 34669442 · doi:10.1126/scitranslmed.abj7843
What was done
The authors performed a clinical, immunopathological, and transcriptional characterization of two toddlers who died in 1967 in the United States from enhanced respiratory syncytial virus disease (ERD) following immunization with a formalin-inactivated RSV (FIRSV) vaccine.
What was found
The abstract reports that up to 80% of FIRSV-immunized children subsequently exposed to wild-type virus were hospitalized and two died. Beyond these historical epidemiological figures, no specific quantitative or molecular values are reported in the abstract.
Why it matters
Defining the immunopathological and transcriptional signature of human ERD provides reference evidence for safety testing of current RSV vaccines and aids understanding of pathogen disease enhancement.
Limits
The analysis is limited to a sample size of two historical cases from 1967, which restricts generalizability, and no specific quantitative metrics or comparator details are provided in the abstract.
Cited by
- supports In a 1960s clinical trial of an RSV vaccine in infants and toddlers, about 80% of vaccinated children were hospitalized after natural RSV infection compared to 5% of children in the placebo group.