The U.S. Supreme Court case Donna E. Shalala, Secretary of Health and Human Services v. Margaret Whitecotton et al., 1994 revolved around the interpretation of the National Childhood Vaccine Injury Act (NCVIA). The respondents, parents of a child who suffered severe disabilities after receiving a diphtheria-pertussis-tetanus vaccine, sought compensation under NCVIA's no-fault system for vaccine-related injuries or death. They argued that their daughter’s condition was caused by the vaccination she received when she was an infant. However, they were unable to provide conclusive medical proof linking her disability with the vaccine due to lack of diagnostic studies at that time. The court ruled in favor of Shalala stating that petitioners must show not only a temporal connection but also medical evidence supporting causation between vaccination and injury as per Section 300aa–11(c)(1)(C)(ii)of NCVIA . This ruling clarified how claims should be evaluated under this act: it is insufficient to merely demonstrate onset symptoms following immunization; claimants must present preponderant evidence showing direct causal link between vaccines and subsequent health issues.

In the dissenting opinion for Shalala v. Whitecotton, Justice Stevens argued that the majority's interpretation of the Vaccine Act was too narrow and failed to consider its purpose: to compensate victims of vaccine-related injuries without requiring them to prove manufacturer fault. He disagreed with their conclusion that a pre-existing condition must be completely asymptomatic prior to vaccination in order for compensation eligibility under "onset" or "significant aggravation" clauses. Instead, he proposed an approach where if a child had an underlying condition which became significantly aggravated following immunization, they should qualify for compensation even if there were minor symptoms before vaccination. This broader interpretation would better serve Congress' intent when it enacted this legislation - ensuring fair treatment and adequate compensation for those injured by vaccines.