**9. Blood cultures**

These are used if bacteremia or septicemia is suspected. *Streptococci*, *Staphylococci* or *Pneumococci* may be found. In patients with multiple osteomyelitis, with extreme lesions in mandible, blood cultures showed that streptococcal septicemia was the cause. In chronic cases at least 15–30 cc. of blood should be taken for the test; in acute cases, 5 cc. is sufficient.
