Asthma
Bronchiectasis
Eosinophilia
ARDS
PE
Lung abscess
Sarcoidosis
Tb
Gram-positive
Streptococcus pneumoniae
Staphylococcus aureus
Gram-negative
Haemophilus influenzae
Klebsiella pneumoniae
Escherichia coli
Pseudomonas aeruginosa 
Moraxella catarrhalis
Atypical pneumonia
Chlamydophila pneumoniae 
Chlamydophila psittaci
Mycoplasma pneumoniae
Coxiella burnetti 
Legionella pneumophila
Streptococcus pneumoniae
Staphylococcus aureus
Haemophilus influenzae
Klebsiella pneumoniae
Escherichia coli
Pseudomonas aeruginosa 
Moraxella catarrhalis
Chlamydophila pneumoniae 
Chlamydophila psittaci
Mycoplasma pneumoniae
Coxiella burnetti 
Legionella pneumophila
Common
Influenza
Respiratory syncytial virus
Parainfluenza
Rarer
Adenovirus
Metapneumovirus
Severe acute respiratory syndrome (SARS)
Middle east respiratory syndrome coronavirus (MERS)
2019-nCoV (COVID-19)
Cause other diseases, but sometimes cause pneumonia
Herpes simplex virus
Varicella-zoster (VZV)
Measles
Rubella
Cytomegalovirus
Smallpox
Dengue
Influenza
Respiratory syncytial virus
Parainfluenza
Adenovirus
Metapneumovirus
Severe acute respiratory syndrome (SARS)
Middle east respiratory syndrome coronavirus (MERS)
2019-nCoV (COVID-19)
Herpes simplex virus
Varicella-zoster (VZV)
Measles
Rubella
Cytomegalovirus
Smallpox
Dengue
Histoplasmosis
Coccidioidomycosis
Blastomycosis
Pneumocystis jirovecii pneumonia (PCP)
Sporotrichosis
Cryptococcosis<unk> 
Candidiasis
Ascariasis
Schistosomiasis
Toxoplasma gondii
Aspergillosis
Asthma
Histoplasmosis
Bronchiectasis
Tuberculosis
Eosinophilia
Coccidioidomycosis
ARDS