Which sputum color is associated with the presence of WBC and bacterial infection?

The color of sputum can provide significant insights into the underlying cause of a respiratory condition. Yellow sputum is often associated with the presence of white blood cells (WBCs), which are a key factor in the body's immune response to bacterial infections.

During a bacterial infection, WBCs are recruited to the site of infection to fight off the invading pathogens. As they die and break down, they can alter the color of sputum to yellow, indicating the body's response to infection. This color change is typically seen in cases such as bacterial pneumonia or bronchitis.

In contrast, green sputum may suggest a more significant bacterial infection or the presence of necrotic tissue, while brown sputum could indicate old blood or chronic conditions. Pink frothy sputum often indicates pulmonary edema, which is not primarily associated with bacterial infections. Understanding these colors helps in diagnosing and managing respiratory illnesses effectively.