A microscopic scientific illustration displaying chain formations of erysipelas streptococcus bacteria inside a circular frame 插畫檔

This nineteenth-century engraving presents a medical diagram showing the microscopic structure of the bacterium responsible for erysipelas, scientifically known as Streptococcus pyogenes, which was first successfully isolated and identified through clinical research in Germany. The precise stippled drawing illustrates numerous spherical bacterial cells, or cocci, arranged in distinct, twisting chains of varying lengths scattered across the field of view. Enclosed within a bold circular border that replicates the lens of a laboratory microscope, this historical graphic serves as an educational record from the foundational era of medical bacteriology and infectious disease research.