Pneumonia may be caused by an infection or injury of the lungs.
Opportunistic infections, such as pneumocystis carinii pneumonia, begin to occur.
Opportunistic infections may be a result of an infection or injury of the lungs.
After an infection or injury to the lung, what can happen?

Destroy crops
a lot of human deaths
Plant growth is reduced
destroying life
forest is destroyed
opportunistic infections
death and devastation
negative impact