Pneumonia can also occur in the clinic without elevated white blood cells. A normal white blood cell count in the routine blood count can be seen in pneumonia caused by specific pathogen infections, such as inflammatory reactions in the lungs due to pathogens such as Mycoplasma, Chlamydia, Rickettsia, and so on. In this case, the blood count is normal and the white blood cells are not elevated. Clinically, this situation is also seen in the recovery stage of pneumonia, or the inactive stage of inflammation, such as chronic pneumonia, the body’s immune system is in a state of equilibrium, and there is no obvious inflammatory response, so the routine blood tests of white blood cells will not be elevated.