Kilmarnock store.A source claimed that a number of workers at the King Street outlet had tested positive for the virus.However, an official from the high street giant said they would not comment on the health and wellbeing of its staff.The popular store was open for business yesterday and continued to operate this afternoon.An M&S spokesman said: "The health and wellbeing of our colleagues and customers always comes first and we have enhanced cleaning procedures and measures in place across all