COMIX Extension (Understanding the dynamics and drivers of the COVID-2019 epidemic using real-time outbreak analytics)

CoMix is a unique social contact survey, which has been collecting data on epidemiologically relevant social interactions since March 24 th 2020 [1]. Data are collected by Ipsos-Mori from two panels of 2500 individuals, who are broadly representative of the UK population by age and geographical location. Panel members report on those individuals they had face-to-face contact with (either spoken or physical contact) over the previous day. Each panel reports on alternate weeks allowing weekly information to be collected. The quantitative data gives direct insight of contact patterns in the community (Fig 1), can be used to estimate changes in the reproduction number some weeks ahead of epidemiological data [1], allows the impact of non-pharmaceutical interventions to be inferred [2] and provides key information for accurate parameterisation of mathematical models. Weekly reports from CoMix are shared with key organisations, including SAGE and JBC and are available online [3].