In 132 consecutive patients with suspected bacteremic infectious diseases, Gram staining of the buffy coat of blood taken from the ear lobe was performed simultaneously with blood cultures. Out of 132 patients, 7 exhibited intraleukocytic microorganisms among 22 with concomitant positive hemocultures and 21 with concomitant sterile hemocultures. Among this latter group of patients, 8 were severely ill subjects with indwelling intravenous catheters and undergoing treatment with broad spectum antibiotics, while 4 were found to have intraleukocytic yeast forms. Eight presented with a typical history of pneumonia. It is concluded that Gram staining of the buffy coat of the ear lobe blood is a simple technique which is of value in the management of patients with suspected bacteremia and of febrile patients with indwellig catheters or under antibiotic therapy.