Ethical challenges posed by human infection challenge studies in endemic settings

Area of Science:

• Infectious Diseases
• Clinical Research Ethics
• Global Health

Background:

• Human infection challenge studies (HCS) intentionally expose participants to pathogens to develop new medical interventions.
• Ethical concerns exist, particularly regarding vulnerable populations, yet HCS are crucial for diseases prevalent in low- and middle-income countries (LMICs).
• Controlling study factors can mitigate risks, but HCS in endemic settings introduce specific ethical challenges.

Purpose of the Study:

• To provide background on HCS methodologies and their application.
• To examine recent HCS conducted in LMICs.
• To offer an overview of the ethical issues pertinent to HCS in endemic regions.

Main Methods:

• Review of existing literature on human infection challenge studies.
• Analysis of recent HCS conducted in low- and middle-income country settings.
• Ethical analysis framework applied to HCS in endemic contexts.

Main Results:

• HCS are valuable for developing interventions against infectious diseases.
• Conducting HCS in LMICs is scientifically and ethically justifiable for neglected endemic diseases.
• Specific ethical considerations arise in LMIC settings, requiring careful management.

Conclusions:

• HCS offer a pathway to accelerate the development of urgently needed interventions.
• Ethical frameworks must be adapted to address the unique challenges of HCS in LMICs.
• Further research and ethical deliberation are needed for responsible HCS implementation in endemic areas.