 At the time the laboratory was established there were a number of common but unidentified disease-causing virus fevers in Trinidad, usually referred to by descriptive names such as "Trinidad 3-day fever", Trinidad 5-day fever", and the like.Some of these were soon isolated and identified.A semi-permanent bush camp was set up at Bush Bush Wildlife Sanctuary in the large Nariva Swamp in southeastern Trinidad and a large tree station was built in the Vega de Oropouche rainforest near Sangre Grande with platforms at 60, 90 and 120 feet (18, 27 and 36.6 metres) to facilitate collecting mosquitoes at various levels in the rainforest, including the forest canopy.