Abstract
Diagnostic strategies in upper and lower respiratory tract infections include conventional procedures and the new molecular tools. Serology plays a role in certain viral and atypical infections of lower respiratory track but is not reliable in small children and in immunocompromised subjects. Antigen detection can be also carried out. If a potential pathogen is non detectable by simply assay or in severe or complicated lower respiratory tract infections, the use of molecular tools is highly indicated.
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