A familial cluster of coronavirus disease 2019 (COVID-19) caused by one family member during his asymptomatic incubation period.

An ongoing outbreak of coronavirus disease 2019 (COVID-19) has rapidly spread in the world, whereas asymptomatic carriers may also play a critical role in the pandemic. We report a familial cluster of COVID-19 caused by one family member before his onset of illness, indicating that it seems to be potentially infectious during the incubation period, even earlier than we expected. Close contact, especially in a small enclosed space, might be the cause of familial transmission.

A cross-sectional survey of nutrition labelling use and its associated factors on parents of school students in Shanghai, China.

Objective: To understand parents' knowledge and use of nutrition labelling and to explore its associated factors.

Design: Cross-sectional survey.

Setting: Two schools providing a nine-year educational programme in Putuo District, Shanghai, China, were selected for the study.