Microbiology

Respiratory viruses make up 2/3rds of all identifiable causes of CAP

Most Common:
Influenza A and B, rhinovirus

Less Common:
Human metapneumovirus, RSV, parainfluenza virus, coronavirus, adenovirus

Bacteria make up 1/3rd of all identifiable causes of CAP

Legionella is rarely identified as the cause of CAP in FH. Cases typically occur in fall and early winter

Classic Legionella pneumonia presents with high fever, pneumonia, and gastrointestinal symptoms. However, more commonly, patients present with various non-specific features. Hyponatremia and hepatic dysfunction is seen more with Legionella pneumonia than other causes of CAP

Urine antigen testing is available and identifies L. pneumophila serogroup 1 which causes most—but not all—cases of Legionella pneumonia

Legionella culture and PCR are also available upon discussion with Medical Microbiologist