This is what happens when we have a lung infection, the symptoms produced are those by the body's immune system to try and rid itself of the infection, or to bring awareness that something is not right and needs attention. Coughing, increased mucus to cough up. Where there is only lung inflammation, more difficulty breathing, tiredness etc, the body produces these symptoms as a communication mechanism. Steroids , treat inflammation (an immune system response), helps with the breathing and the Anti biotics clear the infection and stop bacteria multiplying in the lungs thus.
When steroids have been taken for longer than one month, they must not be abruptly stopped. The dose needs to be gradually reduced to allow the adrenal glands sufficient time to regain their normal function. Full recovery of the adrenal function may take as long as 9 months after steroid therapy has been stopped. Patients on prolonged steroid therapy (or within 9 months of stopping prolonged steroids) who are under severe stress, such as surgery or severe infections, should have their dosage temporarily increased. The dosage of steroids should not be increased without directions from a physician.