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Could a 100-year-old TB vaccine help scientists find a better one?
Harmless vaccine BCG is made of living bacteria; in tests might serve as a proxy for deadly tuberculosis
Scientists ponder human challenge trials for COVID-19 vaccines
Thousands offer to be infected with live virus to speed vaccine development
On the path to a new-generation malaria vaccine
New approach using genetically modified parasite ‘primes the immune system’ in first human trial
Getting malaria on purpose
Volunteers roll up their sleeves and get infected to test an experimental drug