Chief Medical Officer S.N.S. Yadav ruled out any major outbreak of the disease. But several private clinics and state-run hospitals say they have admitted many patients with low platelets and dengue symptoms.
A doctor at a nursing home in Mahanagar told IANS: "We have many dengue patients but no data has been collected by the authorities."
The worst affected is the area around the King George's Medical University in Chowk where more than a dozen medical students have taken ill.
Efforts were on to increase fogging in the city, officials said.