"In pneumonia, the lungs become filled with fluid and inflamed, leading to breathing difficulties. For some people, breathing problems can become severe enough to require treatment at the hospital with oxygen or even a ventilator. The pneumonia that COVID-19 causes tends to take hold in both lungs. Air sacs in the lungs fill with fluid, limiting their ability to take in oxygen and causing shortness of breath, cough and other symptoms," experts at John Hopkins Medicine say.
Other health experts have warned that unlike the general pneumonia, COVID pneumonia spreads like a wildfire, persists in the lungs longer and causes more harm.
The fact that it remains in the lungs for a longer period of time, is what gives the virus more time to harm the body, experts say.