5 doctors weighed in:
How many different strains of pneumonia there are?
5 doctors weighed in

Dr. Michael DePietro
Internal Medicine - Pulmonary Critical Care
3 doctors agree
In brief: Many
If you mean how many different organisms cause pneumonia, a very large number ranging from bacteria, to viruses and fungi.
A strain typically is a genetic variant of a kind of organism, the flu virus can cause pneumonia, but influenza a can have slight variations making one type of strain of influenza slightly different from another ( why every year you need a new flu shot).

In brief: Many
If you mean how many different organisms cause pneumonia, a very large number ranging from bacteria, to viruses and fungi.
A strain typically is a genetic variant of a kind of organism, the flu virus can cause pneumonia, but influenza a can have slight variations making one type of strain of influenza slightly different from another ( why every year you need a new flu shot).
Dr. Michael DePietro
Dr. Michael DePietro
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Dr. Stephen Siegel
Internal Medicine - Pulmonology
1 doctor agrees
In brief: 8 major types, 100's
In only about 1/2 cases of pneumonia no organism is isolated.
Although there are hunderds of strains of pneumonia organims, most common are: streptococcus pneumoniae(50%), haemophilus influenzae (20%), chlamydophila pneumoniae (13%), mycoplasma pneumoniae(3%). Staphylococcus aureus, moraxella catarrhalis, legionella pneumophila and gram-negative bacilli.

In brief: 8 major types, 100's
In only about 1/2 cases of pneumonia no organism is isolated.
Although there are hunderds of strains of pneumonia organims, most common are: streptococcus pneumoniae(50%), haemophilus influenzae (20%), chlamydophila pneumoniae (13%), mycoplasma pneumoniae(3%). Staphylococcus aureus, moraxella catarrhalis, legionella pneumophila and gram-negative bacilli.
Dr. Stephen Siegel
Dr. Stephen Siegel
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