INVESTIGATION OF SECRETORY PHOSPHOLIPASE A2 INHIBITORY ACTIVITY OF BUTANOL FRACTION OF AQUEOUS EXTRACT OF TRAGIA HISPIDA (WEL KAHAMBILIYA) AS A POTENTIAL THERAPEUTIC AGENT FOR DENGUE FEVER D.V.D. Hemalika, A.M. Abeysekera, U.G. Chandrika, G.N. Malavige