However, the health ministry said only 15 cases were reported from the national capital.
One patient was serious and under ventilation at the Ram Manohar Lohia (RML) Hospital here, officials said.
According to the state health ministry, of the fresh cases 15 have been admitted to various designated hospitals and the rest 35 are home-quarantined.
'These 50 identified cases include 24 cases of children. One male patient is critical in the RML Hospital and is on dialysis and on the ventilator,' Delhi Health Minister Kiran Walia said.
She said that till date 772 cases have been reported in the city, of which 681 cases have been treated and discharged.
Walia also said that the situation is under control and the government is doing its best in providing treatment to swine flu patients in government hospitals.
She advised people to visit the doctor at the earliest in case they exhibit any symptom of swine flu.
Fresh cases were also reported from Uttar Pradesh (30), Kerala (2), Haryana (1), Goa (1), West Bengal (1), Uttarakhand (1) and Jammu and Kashmir (1).