aa Rudenko 1996b.

Methods	Cluster‐RCT Inoculation of children from 16 schools and children's establishments, control groups from 14 schools and 20 preschool children's establishments Children observed during vaccination period 6 November to 16 November 1986; rise in epidemic 17 November to 21 December 1986 and postepidemic period 22 December 1986 to 5 April 1987 and number of illnesses recorded Vaccine administered intranasally using a Smirnov measured sprayer Efficacy of vaccine assessed by comparing number of cases of influenza and ARI in vaccinated and UV groups and calculating index of efficacy using "generally accepted methods"
Participants	Children aged 3 to 14 years
Interventions	Live recombinant vaccine made from 2 mono vaccines containing A/47/25/1 (H1N1) and A/47/F (H3N2)
Outcomes	Cases of influenza and ARI Safety: 18 categories of somatic illnesses up to 6 months after inoculation
Funding Source	Unclear
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient description
Allocation concealment (selection bias)	High risk	Not used
Blinding (performance bias and detection bias) All outcomes	Unclear risk	No blinding
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No description
Summary assessments	High risk	Insufficient information to assess study design