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Medical/surgical masks showed no clear difference in viral respiratory illness ‐ influenza/COVID‐like illness compared with no masks (moderate certainty).
Hand hygiene showed no clear difference in laboratory‐confirmed influenza compared with control (low certainty).
Hand hygiene may leads to lower composite of acute respiratory illness, influenza‐like illness,… compared with control (low certainty).
Medical/surgical masks showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 compared with no masks (moderate certainty).
It is very uncertain whether N95 respirators changes viral respiratory illness ‐ clinical respiratory illness compared with medical/surgical masks (very low certainty).
N95 respirators showed no clear difference in viral respiratory illness ‐ influenza‐like illness compared with medical/surgical masks (low certainty).
N95 respirators showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza compared with medical/surgical masks (moderate certainty).
Hand hygiene probably leads to lower acute respiratory illness compared with control (moderate certainty).
Hand hygiene showed no clear difference in influenza‐like illness compared with control (low certainty).
Standard interferon showed no clear difference in death compared with placebo or control (low certainty).
Pegylated interferon alpha‐2a showed no clear difference in sustained virological response 6 months after stopping treatment compared with standard interferon (low certainty).
Pegylated interferon alpha‐2a showed no clear difference in treatment discontinuation compared with standard interferon (low certainty).
Pegylated interferon alpha‐2a showed no clear difference in adverse events compared with standard interferon (low certainty).
The review found no eligible studies for this question.
High showed no clear difference in PEG interferon alpha‐2a compared with low dose pegylated interferon alpha‐2a or alpha‐2b (low certainty).
High showed no clear difference in PEG interferon alpha‐2b compared with low dose pegylated interferon alpha‐2a or alpha‐2b (low certainty).
High showed no clear difference in PEG interferon (combined) compared with low dose pegylated interferon alpha‐2a or alpha‐2b (moderate certainty).