Respiratory viruses including influenza have long been appreciated as a cause of community acquired pneumonia (CAP), particularly among children, people with serious medical co-morbidities and military recruits. They are increasingly recognized as a cause of CAP among adults, particularly older adults. Polymerase chain reaction-based testing has allowed detection of newer agents (e.g. human metapneumovirus, coronavirus HKU1 and NL63) as well as improved the ability to detect “old” viral infections su…
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