Syphilis (lues) is a very easily transmitted infection that can occur all over the body. It can be treated well with antibiotics, and the infection often remains undetected.
Chlamydia is one of the most common sexually transmitted infections (STI) because it is very easily transmitted. If left untreated, the infection can lead to inflammation of the urethra, rectum and genital area.
Gonorrhoea is - together with chlamydia - one of the most common sexually transmitted infections, easily transmissible, usually affecting the mucous membranes of the throat, rectum or urethra.