The signature effect of HIV infection, and the cause of AIDS, is disruption of the T-lymphocyte branch of the immune system and in particular the destruction of CD4+ T-helper cells.
Eric, Erik. The given name Erika, or Erica, is a feminine form of Eric, deriving from the Old Norse name EirÃ­kr (or ErÃ­kr in Eastern Scandinavia due to monophthongization). The first element, ei- is derived either from the older Proto-NorseZ*aina(z) meaning one or some, or from Proto-Norse *aiwa(z) meaning fair or tradition.
See also the related forms, the English Jerica and the English Rickilee. Erica is an all-time favorite. Currently it is still rather popular as a baby girl name, but to a lesser degree than it was before. The name increased in popularity from the 1940s up to the 1980s.