Recovery Time in Children With Lower Respiratory Tract Infections Treated With Klacid® Granules for Oral Suspension.

Inclusion Criteria: * Patients with lower respiratory tract infection. * Patient is male or female \> 6 months and \< 12 years of age. * Prescription of Klacid Granules for Oral Suspension is at the discretion of the investigators according to the clinical condition of the patients * Patients who are suitable for treatment with Klacid Granules for Oral Suspension according to the Prescribing Information Exclusion Criteria: * Known hypersensitivity to or previously intolerant of macrolides. * Illness severe enough to warrant hospitalization or parenteral therapy. * Concomitant use of any of the following medications: * Drugs metabolized by CYP3A isozyme: alprazolam, astemizole, carbamazepine, cilostazol, cisapride, cyclosporin, disopyramide, ergot alkaloids, lovastatin, methylprednisolone, midazolam, omeprazole, oral anticoagulants (e.g. warfarin), pimozide, quinidine, rifabutin, sildenafil, simvastatin, tacrolimus, terfenadine, triazolam and vinblastine. * Drugs metabolized by other isozymes within CYP450 system: phenytoin, theophylline and valproate. * Colchicine * Digoxin * Ritonavir. * Severe immunodeficiency and chronic disease conditions. * Renal or hepatic impairment.