Seven patients have died and several more have been made ill at a hospital in Setagaya Ward, Tokyo, from what is believed to be an infection spread within the facility, the institution said Friday.

The two male and five female patients at Ito Noshinkei Geka Byoin (Ito Neurosurgical Hospital) who died between Jan. 10 and Wednesday may have succumbed after being infected with serratia bacteria.

According to the Health, Labor and Welfare Ministry, Tokyo Metropolitan Government officials have conducted inspections of the hospital as stipulated under the Medical Service Law.