Nicola Sturgeon described the 43 positive cases identified so far, as part of an outbreak at the 2 Sisters food processing plant, as "a significant cluster".
Of those cases, 37 are factory workers and six are contacts. The new guidance, which also includes children in those households and anyone who has had a negative test, has been issued after a meeting of the incident management team which is working with the Scottish Government.
Dr Emma Fletcher, NHS Tayside associate director of public health, said: "This is a critical change to our advice this evening."We are putting in place this extra measure to help prevent further spread of the infection in the community.A high school in Aberdeen has also been forced to close until Monday for a.