HIV is a virus that gradually attacks the immune system, which is our body’s natural defence against illness. If a person becomes infected with HIV, they will find it harder to fight off infections and diseases. The virus destroys a type of white blood cell called a T-helper cell and makes copies of itself inside them. T-helper cells are also referred to as CD4 cells.1
There are many different strains of HIV – someone who is infected may carry various different strains in their body. These are classified into types, with lots of groups and subtypes. The two main types are:- HIV-1: the most common type found worldwide
- HIV-2: this is found mainly in Western Africa, with some cases in India and Europe.
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