Late in the Middle Ages, Italian stargazers gave a name to the annual contagion that rolled around each year like clockwork.

People who caught the flu were up to six times more likely to have a heart attack in the month after the infection.

TAIPEI, Taiwan (AP) — An outbreak of the chikungunya virus in China has prompted authorities to take preventive measures from mosquito nets and clouds of disinfectant, threatening fines for people who ...