Ethics approval and consent to participate
The study proposal was reviewed and approved by India’s Health Ministry Screening Committee (proposal ID 2022–16229, dated 16 March 2022). The protocol was approved by the IRB of CMC Vellore (IRB minutes number 14247, dated 29/09/2021). Any changes or amendments made to the protocol will be submitted to the IRB for approval.Written informed consent will be taken from all adult participants and from the parents of child participants with assent being sought wherever applicable. This will include consent for study staff to review participants’ medical and diagnostic records and store any additional serum samples for future research.