15 LHSC physicians and staff have COVID-19, internal memo shows 55 more under investigation MLHU is currently investigating the case and is in the process of identifying the individual’s close contacts and following up directly to provide specific testing advice.The health unit said those not contacted by the health unit are not considered at risk.There have been at least 40 cases linked to schools in London and Middlesex, with 23 at local elementary schools and 14 at secondary schools..