Pneumonia is the infection in the lung. If at all we have signs of infection, fever, cough, all those symptoms restricted to respiratory system, along with shadowing of the lung, then we call it and the clinical signs of pneumonia. They are classified based on the treatment modalities which are available because we need different antibiotics. So based on that they are classified as community acquired pneumonia, hospital acquired pneumonia, and pneumonia in a compromised host. So we will be restricting ourselves to community pneumonia which is more common and more useful to the public and sometimes aspirational pneumonias and that so why we diagnosed pneumonia. So chest x-ray is a must to diagnose pneumonia and sometimes we have a difficulty of x-ray. So ultrasound is a must for the diagnosis of pneumonia.

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