GROUP of infectious diseases that include epidemic typhus, scrub typhus, and murine typhus.COMMON symptoms include fever, headache, and a rash.The diseases are caused by specific types of bacterial infection.Chlamydia is a sexually transmitted infection (STI) caused by a bacteria called chlamydia trachomatis.Gonorrhoea is an infection caused by a sexually transmitted bacterium that infects both males and females.Hepatitis B is spread when blood, SEMEN, or other body fluids from a person infected with the virus enters the body of SOMEONE who is not infected.Some common sexually transmitted diseases are - Pelvic Inflammatory Disease (PID), Genital Warts and Human Papillomavirus (HPV), Genital Herpes (HSV-1, HSV-2),SYPHILIS, etc.