TABLE 2.

Microbiological findings in the nasopharynx in relation to findings in the middle ear

Nasopharyngeal finding	No. of episodes	No. of cases with identical finding in the middle ear	Positive predictive value (%)	Negative predictive value (%)
S. pneumoniae	36a	21a	64	85
H. influenzae	23	8	35	100
S. pyogenes	3	2	67	100
M. catarrhalis	26	1	4	95
Mixed pathogens	32	1	NDb	ND
Positive Binax NOW test	37	19a	51	75

^aPresence of S. pneumoniae according to culture and/or PCR.

^bND, not done.