Herpes simplex viruses (HSV) 1 and 2 exhibit tropism for mucosal and n
eurologic tissues. Reactivation is extremely prevalent and call be pre
cipitated by a range of local and systemic factors. Respiratory HSV in
fection can manifest as tracheobronchitis with bronchospasm and blocka
ge by thick secretions, as focal necrotizing pneumonitis due to spread
of the HSV from an adjacent focus, or as diffuse interstitial pneumon
ia due to hematogeneous spread and usually accompanied with extrapulmo
nary involvement. Adult respiratory distress syndrome with presence of
the HSV is discussed. Cytologic, histologic, and serologic tests of u
se for the diagnosis are reviewed, as well as more recent techniques u
sing monoclonal antibodies or PCR technology. The management, which re
sts on aciclovir and its derivates, is discussed.