You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is 25 yrs old labourer 3 yrs back presented with penile ulcer which was not treated. Later he presented with neurological symptoms for which he got treated. Test to monitor response to treatment is- and explain in detail?
Labourer is suffering from neurosyphilis. Best test to monitor response to treatment is VDRL- CSF, Blood Titer of > 1:8 is +ve and titre of <1:8 is a False +ve VDRL.