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Early HIV infection

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A woman site on the sofa with a blanket over her and around her shoulders.

What are the symptoms of early HIV infection?

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A woman is resting in bed.

What is the window period for HIV testing?

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A person wearing a surgical glove holds the hand of somebody else. This person is having their finger pricked with a fine needle. The needle has drawn a small amount of blood which is visible. The image has a pink and purple filter over it.

Sensitivity and specificity of HIV tests

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A close-up of somebody's hand. They are wearing blue surgical gloves and holding a vial that contains a small amount of blood. The image has a pink and purple filter over it.

False positive results on HIV tests

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An empty vial marked with the word "HIV" resting in a test tube. The image has a pink and purple filter on it.

False negative results on HIV tests

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A person wearing a surgical glove holds the hand of somebody else. This person is having their finger pricked with a fine needle. The needle has drawn a small amount of blood which is visible. The image has a pink and purple filter over it.

CD4 cell counts

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A vial of blood is resting on a form that indicates it will be tested for CD4 cells. The image has a pink and purple filter over it.

CD4/CD8 ratio

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A person wearing a blue surgical glove holds a vial of blood in front of a bloodwork form. The option "CD4 CD8" is checked. The image has a pink and purple filter over it.

Viral load

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A close up of a person's arm while they are having their blood taken. The person taking the blood is wearing surgical gloves. We can see some of the blood is already in the tube.

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