748 tests for Covid-19 were carried out at Mayo University Hospital between 25th May and 14th June.
The figures were given by the HSE at yesterday's online meeting of the Regional Health Forum in response to queries from Castlebar Councillor Michael Kilcoyne.
Over the same 3 week period, almost 700 Covid-19 tests were carried out in the community in Co Mayo.
571 of the Mayo tests were positive.
However, Councillor Kilcoyne was informed that Covid-19 tests are not available on demand from people concerned about caring for elderly or vulnerable people - they must be referred by a GP.
Councillor Kilcoyne had also asked about the total number of people who died at Mayo University Hospital and other HSE healthcare facilities in Co Mayo since the start of the pandemic - but was told that this information could not be provided.
Councillor Kilcoyne told Midwest News this evening that it was more a case of the Saolta Hospital Group refusing to provide the figures.