The Anti-Brucella IgG & Body (Brucella IgG) test is a blood test that detects Immunoglobulin G antibodies your body makes to fight Brucella bacteria, which causes the disease brucellosis (undulant fever) from infected animals/products. It helps diagnose current or past infections, especially with flu-like symptoms (fever, sweats, fatigue, joint pain). A positive result usually means past or ongoing infection, often confirmed with further testing like IgM detection or agglutination tests