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Some children acquire a heart problem after an illness in childhood, and this is called an acquired heart defect.

Once a person with leprosy begins treatment they quickly become non-infectious.

Non-specific urethritis (NSU) means any inflammation of a man's urethra that is not caused by gonorrhoea.

Some foods include ingredients that have been genetically modified (GM), or are made using ingredients derived from GM organisms.

Gastritis, inflammation of the stomach lining, may be caused by many factors including infection, alcohol, particular medications and some allergic and immune conditions.

Cystitis is the most common urinary tract infection in women.

Most stomach ulcers are caused by infection or medication, not stress or poor diet.

Trichomoniasis (or trichomonas) is a sexually transmissible infection (STI). Includes causes, symptoms, transmission, diagnosis, treatment, prevention, notifying partners and where to get help.

Many bacterial infections can be treated with antibiotics, but they are useless against viral infections.

Problems only occur if a woman becomes infected with parasites that cause toxoplasmosis for the first time while pregnant.