Four people in Alamance County were legally confined to their homes pending the results of tests for the H1N1 swine flu virus.

Friday night, county health officials told FOX8 News three of the test results were negative. Results of the fourth test have not come back.

The county health department had placed two additional people under legal isolation, but tests revealed neither individual had any flu virus.

Alamance County Health Director Barry Bass said people under legal isolation must stay at specific addresses mandated by the health department. If they don't stay there, Bass says, "they're subject to legal sanctions, which would include incarceration."

Family members of those affected are asked, but not ordered, to stay inside.

There are two suspected cases of swine flu in Guilford County, although the health department has not issued any legal isolation orders because the two people agreed to remain in isolation.

Randolph, Rockingham and Davidson counties have no suspected cases of H1N1 swine flu.

North Carolinians placed under legal isolation must remain in their homes until test results clear them of the virus. Only the county health directors can issue the order, and he or she must have probably cause to believe someone is ill. No tests are required before issuing the isolation order.

On Thursday, the state health director said there are two "probable" cases of H1N1 swine flu virus in North Carolina. South Carolina has 10 confirmed cases and there are two in Virginia.