TABLE 4.

Microorganisms isolated from two groups of 490 children each^a

Microorganism	Ill children		Controls
	No.	%	No.	%
Bacteria
Streptococcus pyogenes (group A, beta-hemolytic)	188	38.4	13	2.7
Streptococcus species (beta-hemolytic, not group A)	33	6.7	31	6.3
Streptococcus species (group D)	38	7.8	40	8.2
Streptococci, viridans group	472	96.3	466	95.1
Haemophilus influenzae	47	9.6	52	10.6
Haemophilus parainfluenzae	66	13.5	61	12.4
Haemophilus parahemolyticus	76	15.5	97	19.8
Haemophilus hemolyticus	3	0.6	3	0.6
Staphylococcus aureus	57	11.6	109	22.2
Staphylococcus epidermidis	375	76.5	340	69.4
Diplococcus pneumoniae	39	8.0	32	6.5
Neisseria species	478	97.5	460	93.9
Corynebacterium species	39	8.0	36	7.4
Klebsiella species	5	1.0	3	0.6
Enterobacter species	5	1.0	3	0.6
Escherichia coli	14	2.9	17	3.5
Pseudomonas aeruginosa	4	0.8	2	0.4
Herellea vaginicola	3	0.6	0	0
Viruses
Influenza A2/Hong Kong virus	27	5.5	0	0
Adenovirus	24	4.9	1	0.2
Parainfluenza virus	23	4.7	0	0
Rhinovirus	6	1.2	0	0
Herpes simplex virus	9	1.8	0	0
Respiratory syncytial virus	3	0.6	0	0
Coxsackie B virus	2	0.4	0	0
Cytomegalovirus	2	0.4	0	0
Poliovirus	1	0.2	1	0.2

^aAdapted from reference 21 with permission of the publisher. Percentage values refer to the number of swabs cultured (of 490 total in each group).