A urinary tract infection in which bacteria lodge in the urinary bladder and multiply, causing inflammation, is known as:

1. Cystitis is bladder infection where bacteria lodged in the urinary bladder multiply and cause inflammation. 2. It is most common in the 20 to 50 age group. 3. Kidney infection is when bacteria travel up to the kidneys, so it is wrong. 4. Asymptomatic bacteriuria shows no symptoms, and tetany is a calcium-related muscle disorder, so they are ruled out. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 17 Reproduction in Plants and Animals "Cystitis or Bladder infection", p.262_