Results from an early trial for a vaccine for Dengue fever. Patients were randomized into two groups. Patients in the treatment group received the vaccine, and those in the control group received a placebo. After 6 months, each patient was injected with a weaker virus of Dengue. Researchers subsequently took blood measurements, inspecting if any virus was present, and also reported if any rash developed.

Data Source: Nature.com article: "Dengue vaccine aces trailblazing trial".

• condition: What the patient received, either the vaccine or a placebo.
• virus.in.blood: Whether a patient had Dengue virus present in her / his blood.
• develop.rash: Whether a patient developed a rash.