Leptospira ELISA

Function

The Leptospira ELISA (Enzyme-Linked Immunosorbent Assay) is a serological test designed to detect specific antibodies (IgM and IgG) produced by the immune system in response to an infection with Leptospira bacteria. These spirochetes are typically transmitted through the urine of infected animals, particularly rodents and livestock, often via contaminated water or soil. The test serves as a primary tool for diagnosing Leptospirosis, a zoonotic disease that can range from mild flu-like symptoms to severe organ failure.

Why it is Ordered

Physicians order this test when a patient presents with symptoms suggestive of Leptospirosis, especially if they have a history of high-risk exposure (e.g., floods, farming, sewer work, or water sports). Symptoms include:

• High fever and severe headache
• Muscle aches (particularly in the calves and lower back)
• Jaundice (yellowing of eyes and skin)
• Redness in the eyes (conjunctival suffusion)
• Abdominal pain and vomiting

Associated Conditions

Leptospirosis can progress into Weil's Disease, characterized by kidney failure, liver damage, and pulmonary hemorrhage. It is also associated with aseptic meningitis and uveitis. Early detection via ELISA allows for prompt antibiotic intervention, which is critical in preventing these life-threatening complications. The IgM antibodies usually appear within 3-10 days of symptom onset, making this test useful during the acute phase of the illness.