The incubation period is a long process, averaging 7-10 years, some may go faster, 2-5 years, and a few can go up to 10 years or more without developing the disease. There may be no AIDS-related symptoms during the incubation period. Some people can show flu-like symptoms, such as fever and diarrhea, but they get better quickly. The length of HIV incubation period is related to many factors, such as the way the patient was infected with HIV, the amount of HIV entering the body, the type of HIV, the immune status of the body, the patient’s medication, economic conditions and many other factors, so the incubation period varies greatly between patients.