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[Botany]

8. Tertiary Syphilis

Tertiary Stage

Most people with untreated syphilis do not develop tertiary syphilis. However, when it does happen it can affect many different organ systems. These include the heart and blood vessels, and the brain and nervous system. Tertiary syphilis is very serious and would occur 10–30 years after your infection began. In tertiary syphilis, the disease damages your internal organs and can result in death.

Neurosyphilis and Ocular Syphilis

Without treatment, syphilis can spread to the brain and nervous system (neurosyphilis) or to the eye (ocular syphilis). This can happen during any of the stages described above.

Symptoms of neurosyphilis include

severe headache;
difficulty coordinating muscle movements;
paralysis (not able to move certain parts of your body);
numbness; and
dementia (mental disorder).

https://www.cdc.gov/std/syphilis/stdfact-syphilis.htm