| Date | Event | Description |
|---|---|---|
| 11 August 2009 | Amended | Text added to abstract to highlight current actions: The authors are aware that further trials have been conducted for some of the vaccines included in this review. Authors are preparing new reviews that will update the evidence for vaccines approved for use and vaccines in development. |
| 22 October 2008 | Amended | Converted to new review format with minor editing. |
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