The Caernarfon hospitals have 34 patients with Covid with 14 being linked to the outbreak.
The health board's executive director of nursing and midwifery Gill Harris said: "A programme of staff and patient testing is under way and our priority is to bring this outbreak to a close as soon as possible.
"In recent weeks, cases of Covid-19 have continued to increase in our community and we have seen a rise in the number of patients admitted to our hospitals needing treatment due to contracting the virus. "This is a timely reminder that the virus has not gone away and we would urge anyone who has not received their vaccination toShe said the health board's emergency departments were also experiencing significant pressure"Only attend our hospital sites if it is absolutely necessary, to help us reduce the risk of infection.
"The health service now has a tried and tested set of measures it immediately mobilises to try and minimise the impact of the virus once it gets into a closed setting like a hospital. "Hospitals are full of vulnerable people and we know this cruel disease attacks the vulnerable, wherever they are most vulnerable and these will be difficult days in those settings in north Wales."
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