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Article History

Received: 6 December 2018

Accepted: 29 April 2019

First Online: 21 May 2019

Ethics approval and consent to participate

: The Ethics Review Committee of the Medical Research Institute of Sri Lanka granted ethical clearance. Written informed consent was obtained from each of the selected participants at the household during the study. In case of a child, consent was obtained from the parents’ or from the guardian. Confidentiality was maintained while handing over individual serological reports. Data collection dates were scheduled following prior permission from Regional Director of Health Services, Gampaha and from the relevant MOH.

: Not applicable.

: The authors declare that they have no competing interests.

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