610x564pxAIDS virus, purple microorganism illustration, HIV transmission, sexually transmitted infection, viral infection prevention, red virus cell, immune response depiction
1220x1263pximmune system response, virus and bacteria interaction, antibody production, protein structure in immune defense, pathogen visualization, cellular immunity, microorganism illustration
1024x408pxAIDS infection, HIV virus, immune system response, T Helper Cell, viral infection illustration, blood cell interaction, medical microbiology art