Serious adverse events following immunisation are between 10 to 15 per million population, Rai said. "So, if you do the risk and benefit analysis in adults, it is a huge benefit," he said. In the case of children, he said, the severity of infection is very low and according to data available in the public domain, only two deaths per million population have been reported. "In this section (children), 15,000 (people) are not dying and keeping in mind the adverse effects also, if you do the risk and benefit analysis, then the risk is more than the benefits based on the available data," Rai explained. "Both the objectives are not being fulfilled by initiating vaccination among children," he said. Few countries, including the US, started vaccinating children four-five months ago. The data of these countries should be analysed before initiating Covid vaccination for children, he said.