Question

HIV-1 group M:

1-Has 9 subtypes

2-Cases have only occurred in Africa

3-Is responsible for the fewest number of HIV cases

4-Has 8 subtypes

Answer 1

Ans- HIV-1 group M: Has 9 subtypes.

Discussion: High frequency of the genetic variableness of Human Immunodeficiency Virus is one of the major concern to develop a proper treatment strategy against it. Two major types of this virus are HIV-1 and HIV-2. HIV-1 is the most frequently occurring type and is responsible for 90-95% of all the infections throughout the world. HIV-1 group M- where 'M' is stands for the major group of this type. This major group is again subdivided into 9 subtypes i.e. A, B, C, D, F, G, H, J and K. The subdivision this group is mainly done by their occurrence in the different geographical area (continent). For example, the A subtype is most common in West Africa while the D subtype is dominating in Eastern and Central Africa.