Bacterial infections affect all the organs of the body like lungs & causes pneumonia. Pneumonia symptoms are fever,chills,cough with yellow/green sputum,chest pain,dyspnoea. Its of different kinds. One of the most common type is Walking Pneumonia. Its symptoms are very mild.
http://www.checkpneumoniasymptoms.com
http://www.checkpneumoniasymptoms.com/walking-pneumonia.html