|Description:||This 1976 image depicts some of the Centers for Disease Control (CDC) staff scientists at the entrance of the San Juan, Puerto Rico, Dengue Branch field station.|
The Dengue Branch of the U.S. Centers for Disease Control and Prevention is located in San Juan, Puerto Rico, which has experienced epidemic dengue activity periodically since 1963. Dengue continues to be endemic in Puerto Rico, with three to nine thousand suspected dengue cases reported during non-outbreak years. Since 1990, there have been three large epidemics of dengue. In 1994 there were 24,700 suspected dengue cases reported and in 1998 there were 17,000 cases reported. More recently, in 2007, 10,508 cases of suspected dengue infections were reported. Of these, half were hospitalized and one third reported having a hemorrhagic manifestation.