Some strains of HIV may appear as early as two weeks after infection. Most of the time HIV shows on a blood test two months after infection. It could take up to three months for HIV to appear on a blood test. There is an antibody test or an antigen test. Either test is effective. Blood test detect HIV sooner than the oral test. Seem HIV shows in the blood.

The HIV virus has a certain type of DNA which creates a protein. The protein that HIV creates is known as antibodies. A saliva test could detect the protein that HIV creates. It may not show in the saliva is the virus is in the early stage. If you believe you’ve been exposed to HIV it’s important to get test and to get a follow up test with your medical provider. This will ensure that the test were 100% accurate.

http://www.cdc.gov/hiv/testing/