The COVID-19 Assessment Centre operated by Cambridge Memorial Hospital is closed for the next two days.
The site was initially shut down on Monday as a suspected gas leak prompted an evacuation.
Officials with Cambridge Fire and Enbridge Gas investigated but did not detect any leaks. It was initially reported a foul odour likely entered the building through an open window.
However, the hospital has now provided an update, as some staff have developed symptoms - consistent with those first reported on Monday.
The Ministry of Labour conducted an inspection but once again, no leaks were detected.
As a precaution, the CMH site on Holiday Inn Drive is closed both Tuesday and Wednesday for a more in-depth inspection.
Individuals who had appointments for the Cambridge location can still get tested by heading to the site on Charles Street in downtown Kitchener.