A Blood culture is conducted to find germs or foreign invaders, such as bacteria, fungus, and other pathogens in a blood sample. Blood-infections can be severe as well as fatal as it hampers the normal physiology of important organs. Lungs, Gastrointestinal Tract, Gallbladder, Kidney, Heart are common sources of blood-borne infections. Weak or compromised immunity is another reason for infection, especially in case of newborns, kids and older people. Sometimes typical symptoms like fever, nausea, fatigue, muscle aches or inflammatory signs may or may not be observed. In a serious case, an infection can spread to the other parts and become systemic, which is known as sepsis. Blood culture is done more regularly for patients infected with HIV, diabetes, cancer and autoimmune diseases.