The 1964 chikungunya epidemic at vellore, South India, including observations on concurrent dengue

Abstract
Virological and serological studies on 477 fever patients seen at the Christian Medical College Hospital, Vellore, South India, from mid-August through December, 1964, indicated that 274 patients suffered infection with chikungunya virus alone (virus recovered from 224), 14 with both chikungunya and dengue viruses, either simultaneously (8) or sequentially (6), and 6 with dengue virus only.