LONDON — Scientists have discovered new antibodies that neutralize viruses that cause dengue, potentially putting a universal vaccine within reach for a mosquito-borne illness that strikes an…

WASHINGTON, D.C. – A mild fever was the first sign that the nurse in Dallas was infected in Ebola. She started feeling ill last Friday. It was alarming…

NEW YORK — Thomas Eric Duncan, the first person diagnosed with Ebola in the United States, died from the virus Wednesday while in isolation at a Dallas…

Women arguably have been hit hardest by Alzheimer's disease: Two-thirds of those with the dementia-causing disease are women, and women serve more often than men as their…

FREETOWN, Sierra Leone — The dreaded Ebola virus came to the children's hospital in the form of a 4-year-old boy. His diagnosis became clear three days after…

Two Costa Rica-based USAID workers left to West Africa this month to lead disaster-relief efforts in the wake of the Ebola virus outbreak. Tim Callaghan and Phil Gelman…

When people get seriously ill, they rarely suffer alone. Whether it’s cancer or HIV, depression or STDs, their trauma sends ripples of emotion through family and friendships,…