Chlamydia are bacteria which pass from cell to cell as tough spherical spore-like elementary bodies. EBs are furnished with projecting spikes (golden) that inject material into the host cells. This image shows chlamydial particles approaching and docking with a cell covered in microvilli...Chlamydia is a major sexually transmitted disease and can go undetected causing infertility. It also causes the eye disease trachoma, which can cause blindness.