Inactivated influenza vaccine vs placebo or no intervention: Influenza‐like illness
Inactivated parenteral influenza vaccine probably leads to lower influenza‐like illness assessed by subjective report Timing of… compared with placebo or 'do nothing' (moderate certainty).
What each review found
Include earlier review versions| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
Inactivated parenteral influenza vaccine vs placebo or 'do nothing' Influenza‐like illness assessed by subjective report Timing of assessment: most studies tested vaccines over a single influenza season · healthy adults Inactivated parenteral influenza vaccine probably leads to lower influenza‐like illness assessed by subjective report Timing of… compared with placebo or 'do nothing' (moderate certainty). Vaccines for preventing influenza in healthy adults (2018) · Cochrane Headline outcomes only | RR 0.84 [0.75, 0.95] | 16 studies · 25795 participants | Moderate |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Vaccines for preventing influenza in healthy adults 2018 · Cochrane Headline outcomes only | Not reported | list not extracted yet | Not assessed |
Studies behind the findings
None of these reviews ties its included studies to this outcome in the data here. Cochrane reviews and reviews with headline outcomes only do not list their studies yet.
How reviews are matched to this question
Reviews word the same question differently. Four decision models (TypeSafe's Jev, Liquid AI's d1-ultra, SubQ Snap and Baseten's Elephant) judged each wording of the population, intervention, comparator and outcome against the others; two wordings count as the same when at least three of them agree and none clearly disagrees, and findings count as this question only when all four elements match. Timing, setting and subgroup never split a question: they are shown on each finding.