Pneumococci are Streptococcus pneumoniae, which can cause pneumonia, and the resulting pneumonia can have more characteristic manifestations, mainly in the coughing up of sputum. The color of the coughing sputum can be rusty, which can differ from the color of the coughing sputum caused by other pathogenic microbial infections. For example, Staphylococcus aureus is a purulent coccus, so pneumonia caused by its infection can have pus and blood sputum. Pneumonia caused by Klebsiella pneumoniae can have a brick-red, jelly-like sputum. For P. aeruginosa, the coughing sputum can be pus-like, but the sputum can be blue-green in color. For anaerobic infections, the sputum can be fishy smelling sputum. In Candida infection, the sputum can be mucousy, and in mycoplasma infection, the cough is often dry without sputum. In Aspergillus infections, the cough can be dry or brownish-yellow sputum. So in terms of sputum, there is some differentiation from other microbial infections. Streptococcus pneumoniae also often causes lobar pneumonia, which can be seen on X-rays and chest CT as a solid change in the entire lobe or segment of the lung.