My Husband Is An Active And Healthy 75 Yr Old

My husband is an active and healthy 75 yr old guy. He has self catheterized for close to 10 years with minimal infections. He was admitted for urosepsis 4 months ago, and was just in the hospital for 1 week again for the same thing. Is this recurrence because it never healed in the first place? Also, he is very anxious to mow the lawn, etc.. Can you give me some sound advice (I can pass along to him) that will keep him laying low to heal. Thank you kindly!