Microbiology: describe all the phases of syphilis.

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Microbiology: describe all the phases of syphilis
Syphilis is an STI that is spread by the bacterium treponema pallidum and the 4 phases of syphilis are primary, secondary, latent, and tertiary.
Primary
In the primary phase the symptoms and signs are the appearance of a painless open ulcer called chancre that is present on the genitals, mouth, skin, rectum, or vagina. The appearance of chancre usually occurs about three weeks after infection, but it may appear later (CDC). The lymph nodes in the region become inflamed and if there is no treatment in a period between 3 and 6 weeks, both the chancre and the inflammation of the nodes disappear. Thus, without adequate treatment, the disease can progress to the other phase and there are complications.
Secondary
The secondary syphilis phase usually occurs 2 to 8 weeks after the appearance of the chancre, but sometimes both phases can occur at the same time. Secondary syphilis is characterized by a rash that can be highly variable in appearance and affect...