Supervisors have cancelled vacations for doctors and ordered them back to work as patients crowded New Delhi's state-run hospitals.
Teams of workers have fanned out across the city to spray insecticides on stagnant water collecting in puddles after recent monsoon rains.
Dengue is often seen as an urban disease with mosquitoes breeding in stagnant water. Outbreaks are reported every year after the monsoon season that runs from June to September. However, this year's outbreak has been described as the worst in five years