Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

72 questions · 72 findings · 12 reviews

No studies found 13 · 18.1%GRADE not reported 0 · 0%Very low 7 · 9.7%Low 21 · 29.2%Moderate 25 · 34.7%High 6 · 8.3%

Influenza vaccine vs no vaccine

All‐cause mortality, solid and haematological malignancies · immunosuppressed adults with cancer

It is very uncertain whether influenza vaccine changes all‐cause mortality, solid and haematological malignancies compared with no vaccine (very low certainty).

1 finding from 1 review

Live attenuated influenza vaccine vs placebo or no intervention

Influenza assessed by laboratory confirmation · healthy, community‐dwelling children younger than 16 years of age

Live attenuated influenza vaccine probably leads to lower influenza assessed by laboratory confirmation compared with placebo or do nothing (moderate certainty).

1 finding from 1 review