Treponema Pallidum Haemagglutination is a test that detects syphilis (a sexually transmitted disease) by detecting palladium antibodies against Treponema Pallidum bacteria. It takes nearly 21-90 days for first symptoms to occur after contracting the bacteria. So, if you’ve had uprotected sexual intercourse in the recent past or are experiencing any initial symptoms (rashes, fever, swollen lymph nodes, sore throat, patchy hair loss, headaches, weight loss, muscle aches, or fatigue), it is crucial to get tested immediately for timely treatment.