Certain symptoms may indicate the presence of a more serious infection, including:

• Pain in your tummy (abdomen) or low back (loins/flanks)
• A fever (high temperature) or chills (rigors)
• Passing larger amounts of urine than normal (polyuria) & excessive thirst (polydipsia)
• Blood in the urine (haematuria)
• Headache/vomiting/flu-like symptoms
• Offensive vaginal discharge

Anyone experiencing the above symptoms should see a doctor in person, as soon as possible.