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No. Due to how the pathogens that cause a particular STD cannot survive in inanimate surfaces, it is implausible for one to contract an STD from a surface that once came into contact with an infected individual. In most cases, direct contact with infected bodily fluids is the method that has the highest potential to induce transmission of the pathogenic microorganism. Nevertheless, it is still a practical matter of hygiene to ensure that any surfaces you come into contact with are clean and appropriately sanitized to avoid the transmission of other microorganisms that may not necessarily induce an STD.

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.

Trichomoniasis is a relatively distinct STD because it is caused by neither a bacterial nor a viral infection. Trichomoniasis is an infection caused by a protozoan parasite known as Trichomonas vaginalis.

Gonorrhea is known for its tendency to mainly target the mucosal membranes of the body – leading to its manifestations primarily being observed in areas where discharge is evident, i.e., mucosal areas. Gonorrhea is caused by the microorganism known as Neisseria gonorrhoeae or N. gonorrhoeae.