LEBEAU / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY LEBEAU / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Streptococcus bacteria in sputum. Light micrograph of clusters of Streptococcus pneumoniae bacteria, in human sputum. Sputum is saliva mixed with mucus coughed up from the respiratory tract. Human cells from the throat and lining of the mouth are seen (red). Bacteria (black dots) are visible as spherical cocci which are non-motile and Gram- positive. They tend to form short chains. Streptococcus pneumoniae occurs both as a healthy commensal and a pathogen in the human respiratory tract. When pathogenic, it is a common cause of lobar pneumonia, bronchopneumonia, pleurisy, peritonitis and meningitis.
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