The Centers for Disease Control and Prevention have released its latest set of numbers showing substantial or high rates of COVID-19 transmission, which it uses as its guidance to masking indoors regardless of vaccination status.

In Pennsylvania, most of the state is still considered to be in either low or moderate transmission status as of Saturday. While two counties showed high rates of transmission and five with substantial last week, that has grown to four counties with high rates of transmission and five with substantial this week.

The high-rate counties are mostly in the northwest part of the state: Crawford, Warren and McKean counties, as well as Armstrong. Substantial-rate counties include Philadelphia, as well as Lawrence, Clearfield, Northampton and Adams counties.

Cannot see the map? Click here.

The CDC determines the transmission rate by studying new cases per 100,000 people and the positivity rate of new tests, both over the past seven days. Counties with substantial transmission have between 50-99 new cases per week, those with high transmission have more than 100.

As for positivity rates, counties with substantial transmission have between an 8% to 9.99% positivity rate, while those with high transmission have a positivity rate higher than 10%.

Should the two metrics fall into different categories, the higher is taken.

According to the CDC, the Pennsylvania Department of Health and the city of Philadelphia, the case and vaccine breakdown for these counties between July 25 and 31 are as follows:

ADAMS COUNTY: 56 new cases reported to the CDC, or 54 new cases per 100,000 people and a 3.5% positivity rate. As of Sunday, 47% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

ARMSTRONG COUNTY: 22 new cases reported to the CDC, or 34 new cases per 100,000 people and a 10.2% positivity rate. As of Sunday, 56.1% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

CLEARFIELD COUNTY: 39 new cases reported to the CDC, or 49 new cases per 100,000 people and a 8.7% positivity rate. As of Sunday, 46.3% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

CRAWFORD COUNTY: 29 new cases reported to the CDC, or 34 new cases per 100,000 people and a 10.3% positivity rate. As of Sunday, 46% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

LAWRENCE COUNTY: 62 new cases reported to the CDC, or 73 new cases per 100,000 people and an 6.1% positivity rate. As of Sunday, 48.5% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

MCKEAN COUNTY: 13 new cases reported to the CDC, or 32 new cases per 100,000 people and an 10.4% positivity rate. As of Sunday, 44.8% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

NORTHAMPTON COUNTY: 176 new cases reported to the CDC, or 58 new cases per 100,000 people and a 5.75% positivity rate. As of Sunday, 64.6% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

PHILADELPHIA COUNTY: 829 new cases reported to the CDC, or 52 new cases per 100,000 people and a 3.65% positivity rate. As of Thursday, 73.8% percent of the population above age 10 has received at least one dose of a coronavirus vaccine. (Note: Philadelphia is its own vaccine jurisdiction and reports its numbers separate from the rest of the state.)

WARREN COUNTY: Fewer than 10 new cases reported to the CDC, however testing shows a 12.1% positivity rate. As of Sunday, 45.8% percent of the population above age 10 has received at least one dose of a coronavirus vaccine.

Cannot see the map? Click here.

A CDC report released Friday showed that the delta variant of COVID-19 is as dangerous as chickenpox and may be more dangerous than other versions of the virus.

The delta variant is also prompting employers such as Walmart and Disney to require that their employees be vaccinated. You will also need to show proof of vaccination to attend a Broadway show when venues reopen.