Immunodeficiency results in an inability to combat certain diseases and may be of two types: primary or secondary. Primary immunodeficiency is usually an immunodeficiency that one is born with. In the case of secondary immunodeficiency, one is born with normal immune responses but some secondary factor or occurrence causes a decrease in immune responses.
Thumbnail: Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has been colored to highlight important features; see PHIL 1197 for original black and white view of this image. Multiple round bumps on cell surface represent sites of assembly and budding of virions. Images used with permission (Public Domain; This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #10000).
Dr. Gary Kaiser (COMMUNITY COLLEGE OF BALTIMORE COUNTY, CATONSVILLE CAMPUS)