The STD that is known as the silent disease:

Question

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Chlamydia is often referred to as the silent disease because it often has no symptoms or mild symptoms that can be easily overlooked or mistaken for another condition. As a result, many people with chlamydia may not realize they have it and can unknowingly spread the infection to others. It is important for sexually active individuals to get regular STD testing to check for chlamydia and other STDs that may not have obvious symptoms.

The STD That Is Known as the Silent Disease