Selkova 2005a.

Methods	Randomised, placebo‐controlled trial of Oscillococcinum® in the prevention of influenza‐like illness
Participants	100 professional staff (average age, 50 years approximately) in outpatient health clinic, Moscow, Russia; those with influenza‐like symptoms in previous 2 days or have family contact/s displaying influenza‐like symptoms
Interventions	Oscillococcinum®, prophylactically, once per week for 4 weeks
Outcomes	Number of participants who fell ill with influenza symptoms
Notes	Methodological details for each study are scantily described, but the tabulations of key results for each are clearly presented Research setting: outpatient health clinic, Moscow, Russia
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No information on actual randomisation method
Allocation concealment (selection bias)	Unclear risk	No description of allocation procedure
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No description of blinding procedure
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No description of blinding procedure
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information provided
Selective reporting (reporting bias)	Unclear risk	Insufficient information provided
Other bias	Unclear risk	Insufficient information provided