Essentially, yes. Considering how most STDs are, in fact, asymptomatic for the majority of their life cycle, a particular STD can remain asymptomatic for extended periods – making it harder to diagnose the condition, let alone think about getting tested for that specific condition. Please do note, however, that most STDs are not necessarily self-limiting, meaning that while they are not symptomatic in any way, it does not imply that the pathogen is not proliferating and causing any damages to the structure of the genitalia. Annual routine testing is still recommended to rule out even asymptomatic STD cases.
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