Table 3.

Laboratory tests in multicenter case–control study of pneumonia etiology in children

Samples	Population	Analyses
Nasal swab/aspirate	Cases and controls	Molecular detection of viruses and bacteria S. pneumoniae typing
Pleural effusion	Cases (if pleuritis)	Molecular detection of viruses and bacteria S. pneumoniae typing
Whole blood	Cases	Molecular detection of viruses and bacteria
		S. pneumoniae typing
		Blood culture
		Blood count
Serum	Cases	C-reactive protein
		Procalcitonin
Urine	Cases	Broad antibiotic detection