A further 12 workers at the Amazon fulfilment centre in Dunfermline have tested positive for coronavirus.
NHS Fife says a total of 15 people with links to the facility have now been confirmed as having Covid-19.
A statement from the health board said: "All positive cases are experiencing mild symptoms and are isolating at home with other household members.
"Contact tracers from the Test and Protect team are in the process of identifying and tracing the known contacts of the positive cases to provide public health support and advice.
"The incident management team is currently looking into any potential link between the cases, however, there is no evidence at this stage to suggest any widespread transmission of the virus among staff working at the facility.
"Anyone who develops any of the established symptoms of the virus, such as a fever; or a loss or change in taste or smell; or a new and continuous cough, should arrange testing using the UK Government Citizens’ Portal at: https://www.nhs.uk/ask-for-a-coronavirus-test or by calling 0800 028 2816."
A spokesperson for Amazon said: "We are supporting the individuals who are now in quarantine.
"Since the early days of this situation, we have worked closely with local authorities to proactively respond, ensuring we continue to serve customers while taking care of our associates and we’re following all guidelines from local officials about the operations of our buildings.
"We have implemented proactive measures at our facilities to protect employees including increased cleaning at all facilities, maintaining social distance in our sites, and adding distance between drivers and customers when making deliveries."
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