abstract background biology blood blood cells body carbon dioxide cell count circulation concept corpuscle design disease erythrocyte fill graphic haemoglobin health hemoglobin illness iron macrocyte medicine megaloblast megalocyte microscopic New original oxygen platelets red red blood cells render science sickness style texture transfusion unique vector analyse backdrop bacteria blood analysis cells cleaning clusters color colour contamination culture disinfect germs green health care immune immune system immunity infection medical microbes mitosis pathogens petri dish probiotics sample slides swab test tissue unclean virus dez pain multicolored multicoloured xymonau Ebola abuse addict addicted addiction addictive ailment bad barrel cancer cancerous cannon carcinogen caution cigarettes conceptual danger dangerous deadly death drug fatal free habit image isolate isolated isolation lethal nicotine object photo photograph picture poison poisonous resource smoke smoker stock tobacco unhealthy vice warning weapon white alert comic comical condom contraception contraceptive healthcare healthy humor humorous humour humourous intercourse latex message metaphor metaphorical prevent preventive protection protective safe sex sexuality std symbol symbolic symbolism symbolize warn