To maximize the shelf life of cooked ground beef for safety and quality, refrigerate the ground beef in shallow airtight containers or wrap tightly with heavy-duty aluminum foil or plastic wrap. Properly stored, cooked ground beef will last for 3 to 4 days in the refrigerator. To further extend the shelf life of cooked ground beef, freeze it; freeze in covered airtight containers or heavy-duty freezer bags, or wrap tightly with heavy-duty aluminum foil or freezer wrap.
UK guidelines state that 4th generation HIV tests (antigen/antibody) will detect 95% of infections four weeks after exposure. A negative test after four weeks then needs to be confirmed with a second test three months after the risk. This is in case you take longer than four weeks to generate an antibody response. In high risk exposures, especially if symptoms occur, viral load testing is sometimes used after one week.
However, even if you don't have any symptoms, you can still infect other people. Six to 12 weeks after the infection, the white blood cells have produced so many antibodies against HIV that they can be measured by a blood test. If you have HIV antibodies in your blood, you are now HIV-positive (HIV+).