Final answer:
Trichomoniasis is a curable STI caused by a protozoan that is usually asymptomatic. It is easily cured with prescription drugs.
Step-by-step explanation:
The curable STI caused by a protozoan that may cause burning or itching, but is usually asymptomatic is trichomoniasis.
Trichomoniasis is an STI caused by the protozoan Trichomonas vaginalis. It infects the vagina and urethra, and symptoms may include burning, itching, and a discharge from the site of infection. However, many cases of trichomoniasis are asymptomatic, meaning no symptoms are present.
Trichomoniasis can be easily cured with prescription drugs.