Table 1.

Characteristics of patients during an outbreak of M. pneumoniae in a nursery school

Patient no.	Gender	Age (yr)	Onset date (day/mo/yr)	Clinical symptoms and examination						Test IgM antibody titer in:		Code no. of strain	Type PCR-RFLP of the P1 gene
				Fever (max temp) (°C)	Cougha	Sore throat	Expectoration	WBCb count (mean no. of cells) (× 103)	X-ray examination of pneumonia	Acute-phase serum	Convalescent-phase serum
1	Male	6	24/05/11	40.0	+	+	+	7.7	+	<1:160	≥1:1,280	1	1
2	Male	6.5	02/06/11	40.5	++	+	+	7.1	+	<1:80	≥1:1,280
3	Female	6.5	07/06/11	41.5	++	+	+	5.2	+	<1:40	≥1:1,280	2	1
4	Male	6	07/06/11	39.0	+		+	5.9	+	≥1:1,280
5	Male	6	08/06/11	41.5	++	+	+	6.1	+	<1:80	≥1:1,280	3
6	Female	5	08/06/11	40.5	++	+	+	5.9	+	<1:160	≥1:1,280	4	1
7	Female	4.5	08/06/11	38.5	+	+	+	3.9		≥1:1,280
8	Male	6	08/06/11	41.0	++	+	+	7.5	+	<1:80	≥1:1,280	5	1
9	Female	5.5	08/06/11	40.0	++	+	+	6.4	+	<1:80	≥1:1,280	6	1
10	Male	6	09/06/11	41.0	++	+	+	7.2	+	≥1:1,280
11	Male	6	09/06/11	40.5	++	+	+	5.3	+	<1:40	≥1:1,280	7	1
12	Male	6.5	09/06/11	41.0	++	+	+	7.9	+	<1:80	≥1:1,280	8	1
13	Male	6	10/06/11	40.0	++	+	+	4.6	+	<1:160	≥1:1,280
14	Female	5	10/06/11	38.5	+		+	4.8		<1:160	≥1:1,280	9	1
15	Male	5.5	11/06/11	40.0	++		+	6.6	+	<1:80	≥1:1,280
16	Male	6	11/06/11	39.0	+	+	+	5.8	+	<1:40	≥1:1,280	10	1
17	Female	6.5	11/06/11	40.0	++	+	+	6.9	+	<1:160	≥1:1,280	11	1
18	Male	5	12/06/11	40.0	++	+	+	7.1	+	<1:80	≥1:1,280	12	1

^aCoughs were scored as follows: +, mild; ++, severe.

^bWBC, white blood cell.