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| Number (n = 71) | Frequency % | Duration after vaccination |
| 17 | 23.9 | 3 weeks to 2 months |
| 17 | 23.9 | 2 months to 3 months |
| 8 | 11.3 | 3 months to 4 months |
| 15 | 21.1 | 4 months to 5 months |
| 6 | 8.5 | 5 months to 6 months |
| 6 | 8.5 | 6 months to 7 months |
| 2 | 2.8 | 7 months and onwards |
