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| Virus | No. infections (N = 56) |
|---|---|
| Influenza A† | 8 |
| Influenza B† | 11 |
| Influenza A and B† | 2 |
| Respiratory syncytial virus‡ | 2 |
| Parainfluenza type 3‡ | 9 |
| Adenovirus‡ | 4 |
| Human metapneumovirus‡ | 20 |
*Virus infections were defined as a >4-fold increase in titers between acute-and convalescent-phase serum samples. †From 128 serum pairs tested ‡From 107 serum pairs tested.
