Doctors on Saturday prescribed “absolute rest” for Pope Francis and modified the treatment for his respiratory tract infection, the Vatican said, a day after the 88-year-old pope was admitted to a hospital following a weeklong bout of bronchitis.

Pope Francis has been prescribed “complete rest” following his hospitalization for bronchitis on Friday. His latest medical woes have revived concerns over his health.

Pope Francis is continuing his treatment for a respiratory infection at Rome's Gemelli Hospital but his condition is improving, according to a Feb. 15 update from the Vatican press office.