A study published yesterday in the Journal of Infection has found that staff working at more than one London nursing home during the peak of the UK COVID-19 outbreak had a quadruple risk of infection.Also, JAMA Network Open today published a research letter showing that US nursing homes that reported COVID-19 cases also had high numbers of deficiencies and substantiated complaints citing failures to comply with federal infection-control requirements.Working at more than one siteThe first study involved testing 250 staff members at six nursing homes with outbreaks for infection with SARS-CoV-2, the virus that causes COVID-19, in April and asking about any symptoms, contact with residents, and whether they worked in more than one home.The