Presence of Numerous Pus Cells Without Detectable Microbes in Gram-Stained Sputum: Introduction, Diagnostic Implications, and Clinical Considerations
Introduction Gram staining is a routine diagnostic tool for respiratory infections. It reveals bacteria in sputum samples. Occasionally, Gram staining shows numerous pus cells but no microbes. This finding raises several clinical questions and concerns. Pus cells indicate an inflammatory response. They suggest a possible …