ca‐Arenz 2005.

Study characteristics
Methods	Cohort study ‐ Germany
Participants	55 families and 43 children. Household contacts in families with at least 1 mumps case. 43 exposed children included in the final analysis, of which 25 were female and 18 were male. Median age was 5 years 3 months in measles cases and 6 years 6 months in contacts without measles. None of the included children had a history of measles.
Interventions	Vaccination with measles‐containing vaccine
Outcomes	Case definition: generalised maculopapular rash with fever 38.4 °C for 3 days and at least 1 of the following signs: cough, coryza, Koplik spots, or conjunctivitis. Primary case: the first household member who acquired measles. Co‐primary cases were defined as measles patients who developed a fever within 4 days after the onset of a rash in the primary case. Secondary cases were confirmed measles patients who developed a fever within 5 to 25 days after the onset of a rash in the primary case. Contacts were all household members who had contact with measles cases in the household during their infectious period.
Funding Source	Government
Notes	Insufficient information about vaccine composition (if MMR or bivalent) for household contact study. Screening method was used for vaccine effectiveness assessment in Coburg school population aged older than 5 years. Many important details are missing.
Risk of bias
Bias	Authors' judgement	Support for judgement
PCS/RCS ‐ exposed cohort selection	Unclear risk	There was insufficient information.
PCS/RCS ‐ non‐exposed cohort selection	Unclear risk	There was insufficient information.
PCS/RCS ‐ comparability	Unclear risk	The cohort was limited to affected classes.
PCS/RCS ‐ assessment of outcome	Unclear risk	There was insufficient information.
Summary Risk of Bias assessment	High risk	We had concerns regarding multiple domains such that our confidence in the result is substantially lowered.