Inside the trend of infecting healthy people for vaccine research

Medical experiments involving intentionally infecting people with bacteria, viruses and parasites are surprisingly common. And they are becoming more common worldwide, particularly in developing countries.


The ultimate aim of these 'human challenge studies' is usually to test potential new vaccines.

However, because of the risks involved, this kind of research raises difficult ethical questions. For example, who should be infected? And which pathogens would be too dangerous to use?

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