The Covid-19 test centre in Buncranna has the highest postivity rate for both walk in and referral tests in the country.
28.4% of walk tests taken at the centre in the Donegal town came back positive as of Tuesday while 23.6% of referrals were positive.
Figures from the HSE show the test centre at Tallaght Stadium has the second highest positivity rates for self-referrals in the country, at 23 per cent.
Donegal GP Denis McAuley says the figures in Buncrana are shocking.
