In one study undertaken in the United States of America, which aimed to analyze therelationship between the individuals' knowledge regarding HIV and their adherence to thetreatment, it was ascertained that knowledge on their state of health, including aspectsrelated to the disease's development, such as CD4 count and viral load, contribute tothe involvement of people living with AIDS in their adherence to the treatment.17 This evidence concerns the gene CD4 and AIDS.