Quick Answer

The Willowbrook hepatitis study was meant to learn how viral hepatitis spreads and how to prevent it, focusing on what are now called hepatitis A and hepatitis B. Researchers deliberately infected children with intellectual disabilities at a New York state institution to track the infection and test immune globulin and early vaccine approaches. The study is widely considered unethical because it caused harm without valid informed consent.

  • It took place at Willowbrook State School in the 1950s and 1960s.
  • Researchers deliberately infected some children to observe hepatitis A and B.
  • The goal included tracking transmission, incubation, symptoms, and immune responses.
  • Hepatitis C was not yet identified and was not part of the study.
  • The study lacked valid informed consent and exploited a vulnerable institutionalized population.
  • Its aftermath helped strengthen modern research ethics and consent rules.

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Willowbrook State School was crowded and had poor sanitation, so hepatitis was already common there. Researchers argued that deliberate infection could let them watch the disease under controlled conditions rather than wait for natural cases. They used material from infected residents to expose susceptible children, then followed liver enzyme levels, symptoms, and immunity. At the time, 'infectious hepatitis' and 'serum hepatitis' were not yet clearly separated into hepatitis A and hepatitis B, and hepatitis C was unknown. The work aimed to distinguish these forms, understand fecal-oral versus bloodborne spread, and test prevention with immune globulin and vaccines. That scientific aim does not erase the ethical failure: children with disabilities were harmed without meaningful consent.

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⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.