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[Figure see text].[Figure see text].[Figure see text].[Figure see text].[Figure see text].[Figure see text].[Figure see text].[Figure see text].[Figure see text].Delhi, the national capital of India, has experienced multiple SARS-CoV-2 outbreaks in 2020 and reached population seropositivity of over 50% by 2021. During April 2021, the city became overwhelmed by COVID-19 cases and fatalities, as a new variant B.1.617.2 (Delta) replaced B.1.1.7 (Alpha). A Bayesian model explains the growth advantage of Delta through a combination of increas