M. subba, S. hangma subba, O. T. Lepcha, A. D. Rai, and C. O. Bhutia, “Serosurveillance of COVID 19 among unvaccinated children aged 10-17 in Sikkim, North-Eastern India: A cross-sectional analysis ”, Trop J Pathol Microbiol, vol. 10, no. 03, pp. 51-58, Oct. 2024.