TABLE III.
Subgroup Characteristics of HRSV Isolated From Re-Infected Children
| Patterns of occurrence | No. of re-infected children | Interval of re-infection | No. of children analyzed for clinical features | |||
|---|---|---|---|---|---|---|
| More than 1 separate season | Within a single season | |||||
| A–A* | 50 | 43 | 7 | 47 | ||
| A–B | 35 | 32 | 3 | 33 | ||
| B–B | 10 | 9 | 1 | 9 | ||
| B–A | 43 | 39 | 4 | 40 | ||
| A/B | 13 | 10 | First (5), Second (5) | 3 | First (2), Second (1) | |
| Total | 151 | 133 | 18 | 129 | ||
*
The first letter designates the subgroup responsible for the first HRSV infection, and the second letter, that for the second infection. A/B indicates that dual infection with both subgroups is included in the first or second infection. The numbers in parentheses indicate dual-infected HRSV samples in the first or second infection. The numbers in italics indicate re-infected children who were enrolled for the analysis of clinical features.