Human challenge studies can be useful to test new vaccines and are increasingly being used internationally. Yet there are several ethical issues to consider. from www.shutterstock.com

Infecting healthy people in vaccine research can be ethical and necessary

Deliberately infecting people with a disease-causing agent as part of carefully considered medical research can be ethically acceptable or even necessary.
Health workers from Bwera hospital prepare to transport the body of a fifty-year-old woman who died of Ebola to the burial site in Bwera, Uganda. MELANIE ATUREEBE/EPA

How Africa’s porous borders make it difficult to contain Ebola

Ebola is difficult to contain because of human social and behavioural factors. But it can be if 100% of the infected people's contacts are identified and monitored.

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