Sirisena PDNN, Wickremesinghe NKRD, De Silva ED, Ratnasooriya WD and Handunnetti SM. Inhibition of intracellular killing mechanisms of human neutrophils and the longevity of bioactivities of aqueous leaf extract of Vitex negundo.  Proceedings of the 4^th Annual Scientific Sessions of the IBMBB, University of Colombo, 5^th May 2011; pp 41