Common causes of<unk>  are: * Influenza virus A and B * Respiratory syncytial virus (RSV) * Human parainfluenza viruses (in children) *Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Rarer viruses that commonly result in pneumonia include: * Adenoviruses (in military recruits) * Metapneumovirus * Severe acute respiratory syndrome coronavirus (SARS-CoV) * Middle East respiratory syndrome virus (MERS-CoV) * Hantaviruses Viruses that primarily cause other diseases, but sometimes cause pneumonia include: * Herpes simplex virus (HSV), mainly in newborns or young children * Varicella-zoster virus (VZV) * Measles virus * Rubella virus * Cytomegalovirus (CMV), mainly in people with immune system problems * Smallpox virus *Dengue virus The most commonly identified agents in children are respiratory syncytial virus, rhinovirus, human metapneumovirus, human bocavirus, and parainfluenza viruses.
Viral pneumonia
Fungal pneumonia
Bacterial pneumonia
Dust pneumonia
Atypical pneumonia
Parasitic pneumonia
Aspiration pneumonia
Community-acquired pneumonia