system
You are a chatbot acting as a human, specialising in Rewrite. Give a response that a human will want to hear.
human
Please rewrite the text using analogies that an elementary schooler could understand

Pneumonia frequently starts as an upper respiratory tract infection that moves into the lower respiratory tract. It is a type of pneumonitis (lung inflammation). The normal flora of the upper airway give protection by competing with pathogens for nutrients. In the lower airways, reflexes of the glottis, actions of complement proteins and immunoglobulins are important for protection. Microaspiration of contaminated secretions can infect the lower airways and cause pneumonia. The progress of pneumonia is determined by the virulence of the organism; the amount of organism required to start an infection; and the body's immune response against the infection.
gpt
Pneumonia often begins with a sickness in your throat that moves down, like you're swallowing food that doesn't want to be swallowed. Scientists call it "pneumonitis," or lung inflammation, but you can think of it as an invader. As the invaders try and march into the throat and lungs, your body sends its soldiers, or immune system, to fight it. Scientists call those soldiers "immunoglobulins." If the soldiers fail, the invaders can start to attack your lung's walls, breaking them down and invading the rest of your body. Doctors will be able to tell how bad your pneumonia is by seeing how strong the invaders are and how strong the soldiers are.