At which stage of syphilis is a person asymptomatic but seropositive?

The correct answer is the latent stage of syphilis. In this stage, an individual is infected with the bacterium Treponema pallidum but does not exhibit any symptoms. The person is seropositive, meaning that serological tests can detect the antibodies produced in response to the infection. Although they show no clinical signs of the disease, the bacteria remain in the body and can still be transmitted to others.

In contrast, during the primary stage, individuals have distinctive symptoms such as a chancre, while secondary syphilis presents with systemic manifestations like rashes and lymphadenopathy. The tertiary stage involves more severe complications arising from prolonged untreated syphilis, including cardiovascular or neurological issues. The latent stage is uniquely characterized by the absence of symptoms alongside a positive serological test, making it crucial for diagnosis and management.