Question: what are the 4 stages of pneumonia?
Answer: Congestion. This stage occurs within the first 24 hours of contracting pneumonia. ... 
Red Hepatization. This stage occurs two to three days after congestion. ... 
Grey Hepatization. This stage will occur two to three days after red hepatization and is an avascular stage. ... 
Resolution. ... 
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Is Pneumonia Contagious?