There are several strains of HIV. HIV virus is also known to mutate quite frequently leading to large number of strains. If a person is reinfected with a strain of HIV that is different from the strains already present or if a mutated HIV type is introduced into the body through unsafe sex, treatment will be much more complex and potentially ineffective.
"We are looking forwad to doing more buying with you because of your fast and friendly service. It is hard to that kind now-a-days. Hope to hear from you soon and take care out there on the west coast" (Dave)
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DNA & Genetics
DNA & Paternity
