Two more prisoners have died, one from Low Newton prison, after testing positive for coronavirus.
Both of the prisoners had underlying health conditions.
A Prison Service spokesman said: "A 46-year-old HMP Low Newton prisoner and a 59-year-old HMP Littlehey prisoner died in hospital over the weekend.
"Our condolences are with their families at this time.
"The Prisons and Probation Ombudsman has been informed."
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