You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following causes highest risk of nosocomial infection to a patient - and explain in detail?
Most common nosocomial infection → Urinary tract infection.

Most of the nosocomial UTIs occur after urinary catheterization.

Second most common nosocomial infection → Pneumonia.

Most of the nosocomial pneumonia are acquire through respiratory intubation, mechanical ventilation and suction of the material from the mouth.

Next most common cause of nosocomial infection → Surgical procedures.

Surgical procedures increase a patient's risk of getting an infection in the hospital. Surgery directly invades the patient's body giving bacteria a way into normally sterile parts of the body.
An infection may be acquired from contaminated surgical equipment or from health-care workers. Following surgery, the surgical wound can become infected.