Question

why the people suffering from hiv

Answer 1

People can get hives for lots of different reasons (though sometimes, the cause is not known). One common reason for getting hives is an allergic reaction. Some common allergic triggers are certain foods (like milk, wheat, eggs, shellfish, berries, and nuts), medicines (such as antibiotics), and insect stings or bites.

Answer 2

due to use of infected syringe.
due to transfer of hiv virus due to blood transfusion.