Dengue fever is one of the most severe insect-borne viral infections; it is potentially fatal and is currently endemic in more than 100 countries in Africa, the Americas, the Eastern Mediterranean, Southeast Asia and the Western Pacific, with Southeast Asia and the Western Pacific being the most seriously affected (WHO, 1997). It is a flu-like illness but may develop into the more serious dengue haemorrhagic fever/dengue shock syndrome, which can result in death. In the Caribbean, virological evidence of dengue fever was first obtained in the 1950s, although the disease is believed to have existed there for the past 200 years (Ehrenkranz et al, 1971). The outbreak of dengue haemorrhagic fever in Cuba in 1981, which affected almost half the population, is considered to be one of the most important events in the history of dengue in the Americas (CAREC, 1997). Since this event there have been confirmed or suspected cases of dengue haemorrhagic fever almost every year in the American region. The last large epidemic in Jamaica occurred about ten years ago.