Table 2.

Incidence of Respiratory Syncytial Virus (RSV) Pneumonia by Age and by Strain of RSV

Month of Age at Pneumonia (Rounded Down)	RSV Pneumonia, No.	RSV-B Pneumonia, No.	Follow-up Time, y	RSV Pneumonia Incidencea	RSV-B Pneumonia Incidencea
0	2	2	263	7.61	7.61
1	5	4	261	19.15	15.32
2	10	8	259	38.62	30.89
3	4	3	256	15.60	11.70
4	12	10	254	47.31	39.42
5	10	7	186	53.78	37.64
Total	43	34	1479	29.08	22.99

Abbreviation: RSV, respiratory syncytial virus.

^aIncidence per 1000 person-years.