Jeewandara C., Karunananda MV., Fernando S., Danasekara S., Jayakody G., Arulkumaran S., Samaraweera NY., Kumarawansha S., Sivaganesh S., Amarasinghe G., Jayasinghe C., Wijesekara D., Marasinghe MB., Mambulage U., Wijayatilake H., Senevirathne K., Bandara ADP., Gallage CP., Colambage NR., Udayasiri AAT., Lokumarambage T., Upasena Y., Weerasooriya WPKP., Tan TK., Townsend A., Ogg G., Malavige GN., Perera L., Pushpakumara P., Gomes L., Jayamali J., Aberathna IS., Nimasha T., Dissanayake M., Ramu S., Peranantharajah D., Colambage H., Wickramanayake R., Chathurangika H., Bary F., Yatiwelle S., Harvie M., Deheragoda M., Jayadas T., Ishara S., Ariyaratne D., Dayarathna S., Wijekulasuriya R., Ranathunga C., seroprevalence study group None., Study groups None.