More than you think
Chlamydia is an std
caused by a tiny bacteria
-like critter that lives inside of cells.
There are often very few symptoms with chlamydia so folks can have it and not know it. It can have very dramatic symptoms as well, such as pid (which can be very serious!). Condoms
can provide some protection but abstinence till you are with one person forever is the only truly safe bet for prevention.
Answer assisted by David Miller, Medical Student