Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,315 questions · 23,557 findings · 2,311 reviews

No studies found 4,183 · 17.8%GRADE not reported 3,930 · 16.7%Very low 5,371 · 22.8%Low 5,787 · 24.6%Moderate 3,320 · 14.1%High 966 · 4.1%

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Intervention not reported

Serious adverse eventsClinical manifestation and laboratory examination · people with acute herpes zoster (within 7 days of onset of rash)

It is very uncertain whether the intervention changes serious adverse eventsClinical manifestation and laboratory… (very low certainty).

1 finding from 1 review

Intervention not reported

Non‐serious adverse eventsClinical manifestation and laboratory examination · people with acute herpes zoster (within 7 days of onset of rash)

The intervention showed no clear difference in non‐serious adverse eventsClinical manifestation and laboratory… (low certainty).

1 finding from 1 review

Hand hygiene vs control

Composite of acute respiratory illness, influenza‐like illness, laboratory‐confirmed influenza · general population and healthcare workers

Hand hygiene may leads to lower composite of acute respiratory illness, influenza‐like illness,… compared with control (low certainty).

1 finding from 1 review

Medical/surgical masks vs no masks

Viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 · general population

Medical/surgical masks showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 compared with no masks (moderate certainty).

1 finding from 1 review

N95 respirators vs medical/surgical masks

Viral respiratory illness ‐ laboratory‐confirmed influenza · general population and healthcare workers

N95 respirators showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza compared with medical/surgical masks (moderate certainty).

1 finding from 1 review