Final answer:
The most common strain of HIV infecting patients today is HIV-1 Group M. The HIV infection progresses in three stages, and a patient with 700/μL CD4 T cells without apparent illness is in stage 1.
Step-by-step explanation:
The Most Common Strain of HIV
The most common strain of HIV that infects most patients today is HIV-1 Group M. HIV, or Human Immunodeficiency Virus, is a retrovirus that leads to acquired immune deficiency syndrome (AIDS). The HIV-1 strain is prevalent worldwide, while HIV-2 is mainly found in West Africa. Currently, the majority of HIV infections globally are caused by HIV-1 Group M.
HIV Infection Stages
When people are infected with HIV, their disease progresses through three stages based on CD4 T-cell counts and the presence of clinical symptoms. A patient with 700/μL CD4 T cells and no apparent illness is in stage 1 of HIV infection.