a man with smallpox infection and variola virus, a virus from orthopoxviridae family that causes smallpox

3d background biology cell closeup colorful contagious disease dna epidemic epidemy eradicated eradication health healthcare human illustration immunisation immunity immunization infection injection macro major medical medicine microbe microbiology microorganism minor old orthopoxviridae orthopoxvirus poxviridae poxvirus rendering smallpox structure vaccination vaccine variola viral virion virology virus