Table 2. Samples collection and HRSV subgroup A and B distributions in Beijing during July 2007 to June 2012.
| Epidemic season | Total No. of samples | No. (%)a of antigen-positive samples | No. (%)b of randomly selected samples | No. (%)c of HRSV-A | No. (%)c of HRSV-B | No. (%)c of HRSV with undetected subgroup | No. of complete G gene sequences for HRSV-A | No. of complete G gene sequences for HRSV-B |
|---|---|---|---|---|---|---|---|---|
| 2007/2008 | 2741 | 675 (24.6d) | 101 (15.0) | 92 (91.1) | 8 (7.9) | 1 (1.0) | 39 | 4 |
| 2008/2009 | 3216 | 343 (10.7) | 102 (29.7) | 12 (11.8) | 87 (85.3) | 3 (2.9) | 5 | 27 |
| 2009/2010 | 3588 | 492 (13.7) | 144 (29.3) | 16 (11.1) | 121 (84.0) | 7 (4.9) | 10 | 27 |
| 2010/2011 | 5068 | 594 (11.7) | 180 (30.3) | 162 (90.0) | 12 (6.7) | 6 (3.3) | 57 | 9 |
| 2011/2012 | 5329 | 1056 (19.8d) | 196 (18.6) | 180 (91.8) | 11 (5.6) | 5 (2.6) | 79 | 5 |
| all seasons | 19942 | 3160 (15.8) | 723 (22.9) | 462 (63.9) | 239 (33.1) | 22 (3.0) | 190 | 72 |
a
Percentages apply to the total number of samples.
b
Percentages apply to the number of antigen-positive samples.
c
Percentages apply to the number of randomly selected samples.
d
Infection incidences in 2007/2008 and 2011/2012 epidemic seasons are significantly higher than each of other three epidemic seasons, 2008/2009, 2009/2010 and 2011/1012, by Pearson’s chi-square statistic.