Final answer:
The trigone area of the bladder is frequently the site of bladder infections due to bacterial attachment and the formation of biofilms that resist the body's immune response.
Step-by-step explanation:
The area of the bladder that is frequently the site of bladder infections is the trigone. The trigone is a triangular-shaped area at the base of the bladder, marked by the two ureters in the posterior-lateral aspect and the urethral orifice in the anterior aspect. It is a common location for bacterial attachment and the formation of biofilms that can resist the body's immune response.