A baby receives the rotavirus vaccine during a clinical trial in Niger. The new vaccine is the first designed specifically for children in sub-Saharan Africa. It doesn't require refrigeration and will be cheaper than ones currently available.
Do you know what the deadliest disease is? Hint: It's not Ebola (viral particles seen here in a digitally colorized microscopic image, at top right, along with similar depictions of other contagious diseases)