Within the final week, 13 prisoners in England and Wales have examined optimistic for the lethal bug with different suspected circumstances.
Jo Farrar, chief executive of the Prison and Probation Service, told the Commons Justice Committee around 4,300 prison and probation staff overall were self-isolating at present.
The staff was asked to isolate after 12 confirmed cases.
Mr Buckland said more tests for the virus were needed in prisons, and more personal protective equipment (PPE) was needed for staff.
Jails in England and Wales were put on immediate lockdown on Tuesday with all visits cancelled as it emerged thousands of staff were in self-isolation.
The Jail Officer Affiliation (POA) stated prisoners will exclusively be allowed out of their cells to entry showers, telephones and train - with social distancing restrictions in place.
He added: 'We've continued to work normally for as long as we possibly can and I think families of prisoners will be relieved that they're not at risks and prisoners will be relieved that their loved ones will be safe at home instead of travelling all over the country into packed visit halls and putting themselves at risk.
As of now, visits are not allowed.
The POA stated prisoners due at court docket "will probably be discharged to attend except the courts service advise us in any other case".
Staff at a federal prison in NY did not monitor terrorists' conversations with visitors because poor sound quality left guards unable to hear what was said, according to the report.
Peter Dawson, director of the Prison Reform Trust, said: "The risks of infection for people who live and work in prisons are acute, as the Justice Secretary has said".
The new measures were announced yesterday.
The number of cases, which the Ministry of Justice (MoJ) said was accurate as of 1pm on Wednesday, has jumped up by six in 24 hours.
"That is whereas we guarantee secure and safe functioning of our prisons whereas implementing social distancing".
"If you have a visit booked today, please do not attend".
According to the latest Department of Health figures, there are now more than 8,000 confirmed cases of coronavirus in the United Kingdom - although the actual number cases is likely to be far higher.
In the United Kingdom, 8,077 people have been confirmed to have the coronavirus.