"Four new patients have been detected in the state capital. They are being treated in different hospitals, including PGI and medical university here," Chief Medical Officer S N S Yadav said.
With this, a total of 53 swine flu patients have been detected in Lucknow so far, he said.
A retired Army officer died of H1N1 virus on January 9, while the wife of a retired jawan died on January 13 in the state capital.
The alarm bells were rung two days ago after the death of a woman who had been admitted at the Medical College Hospital in a critical condition.
Principal of J N Medical College, Prof Tariq Mansoor, said there was no need for any unnecessary panic but all necessary precautionary steps are being taken to protect the Medical College staff.