Chlamydia, that caused by Chlamydia trachomatis is a unique organism. It is a very common sexually transmitted infection (STD). Chlamydiae live inside the living cell as viruses, but their structure is similar to the bacteria. Because of the dual nature of Chlamydiae and the ability to parasitize intracellularly chlamydia is extremely difficult to cure.

According to WHO, chlamydia is one of the most common STD worldwide. Every year almost 90 million people infected with chlamydia in the world.
The cycle of Chlamydia trachomatis continues for two days, but in that period they are very sensitive to antibiotics, chemotherapy, ultraviolet rays, and high temperatures.
Chlamydial infection is sexually transmitted. After casual sex chlamydia detected in 50% of women and 60% of men, although a single contact with a patient with chlamydia does not always lead to infection in the partner. The mechanism of transmission of chlamydia is realized with genital-genital, genital-anal and genital-oral sex. Persons aged 17 to 35 years are in the risk group of reproductive tract infections caused by chlamydia. Unsexual route of transmission of chlamydial infection (through infected arms, clothes) considered as irrelevant.
Chlamydia can cause many diseases of the urogenital tract: cystitis, urethritis, cervicitis, erosion, vulvovaginitis, prostatitis, endometritis, epididymitis, coleitis, orchitis, parauretritis, vulvitis, salpingitis, salpingo-oophoritis. Also chlamydial urogenital infection associated with diseases of eyes, joints, respiratory lesions. Chlamydia is also a frequent cause of arthritis, and even disorders of the cardiovascular system.