| Study | Reason for exclusion |
|---|---|
| Keitel 1999 | Safety and immunogenicity study; vaccine not yet tested in efficacy studies |
| Malkin 2005 | Nonrandomized dose‐finding study; no placebo group |
| Ockenhouse 2006 | Nonrandomized open‐label safety and immunogenicity study |
| Pombo 2002 | Nonrandomized study; a trial of repeated infection rather than vaccination |
| Ramasamy 1995 | Nonrandomized study |
| Saul 2005 | Safety and immunogenicity study; vaccine not yet tested in efficacy studies |
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