This means that Powys Teaching Health Board currently has 113.3 Coronavirus cases per 100,000 members of the population.
The latest figure also means that the total number of cases in the health board’s area now stands at 17,684.
Of the latest figures, PHW also showed that 287 tests were completed meaning that 52.3 per cent of those who undertook a test yesterday received a positive result.
In Wales, 5,929 new cases were reported on Monday bringing the total number of cases to 600,682.
Meanwhile there were 129,471 people who tested positive for Covid-19 in the UK yesterday - Tuesday, December 28 - which brings the total number of cases up to 12,338,676.
Covid-19 cases are identified by taking specimens from people and testing them for the presence of the SARS-CoV-2 virus. If the test is positive - except for rapid lateral flow tests which have negative confirmatory lab-based PCR tests taken within 72 hours - this is referred to as a case.
If a person has more than one positive test, they are only counted as one case for all nations with the exception of Wales.
For more information and the latest figures, visit the Public Health Wales website by clicking here.