The deceased at the RML hospital have been identified as 45-year-old Zaibun Nisha, from Delhi, Navin (25) from Uttar Pradesh and Pramod (39) from Bihar, they said.
The trio was admitted to the swine flu ward for treatment, a hospital official, who did not wish to be named, said.
Besides, a native of Faridabad in Haryana succumbed to the deadly virus at the AIIMS last month.
"We had put him on chemotherapy as his condition was very bad. He died of lung failure," he said.
According to official figures four deaths and 241 cases of H1N1 infections have been reported in the city till July 9 this year.
Disclaimer: No Business Standard Journalist was involved in creation of this content