1. https://www.businessinsider.in/science/news/pfizer-biontech-ask-fda-to-authorize-two-dose-covid-19-vaccine-for-children-under-5/articleshow/89286495.cms.
2. https://www.worldometers.info/coronavirus/coronavirus-death-toll/.
3. https://www.nejm.org/doi/full/10.1056/nejmoa2116298.
4. https://en.wikipedia.org/wiki/Rabies.