‘The British government is exploring the possibility of clinical trials in which volunteers are deliberately exposed to coronavirus to test the effectiveness of vaccine candidates, the UK Department for Business, Energy, and Industrial Strategy (BEIS) revealed Wednesday in a statement... In so-called "challenge trials," researchers give study subjects an experimental vaccine and then intentionally expose them to coronavirus to see if the vaccine works. Such trials were used in early research with smallpox, yellow fever and malaria.’
Read here (CNN, Sept 23, 2020)
