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1910 Died Robert Koch, German bacteriologist (Clausthal, December 11, 1843 – Baden-Baden, May 27, 1910). He wanted to become a world traveler and a nature explorer, but he became a doctor. He longed to explore a new field – microbiology. He acquired a microscope and soon microscopy became his main hobby. He is one of the founders of medical microbiology. In 1882, at the Physiological Society in Berlin, Koch presented his own knowledge of the causative agent of tuberculosis, a rod-shaped pathogenic microorganism, which was named the Koch bacillus after him. It was a revolutionary discovery in the fight against the most dangerous disease of the 19th century. He also found the causes of cholera, examined malaria and African sleep sickness, and introduced quinine treatment. In 1905, he received the Nobel Prize in Medicine. He proved that the causes of the disease are living microbes. He discovered procedures for growing and studying bacteria and controlling many infectious diseases. He introduced laboratory culture of bacteria on a nutrient medium. He developed procedures for staining bacterial cells.

1952 Vuk Vrhovac, Croatian internist, endocrinologist, died (Srijemski Karlovci, 13 November 1903 - Zagreb, 27 May 1952). In his hometown he finished the classical grammar school (1921), and the School of Medicine in Zagreb (1927). He specialized in internal medicine in Zagreb (1935). In 1933/34 He studied abroad – the United States, Canada, England, Sweden, the Netherlands, Germany and Austria to study endocrinology and insulin production, as a fellow of the Rockefeller Foundation, and again in 1947 as a fellow of the World Health Organization in Sweden, Denmark, the Netherlands, England and Switzerland. From 1930 to 1935 he was a volunteer assistant at the Medical Clinic in Zagreb. He then worked on the state production of insulin, which he founded, hormonal and organotherapeutic preparations (School of Public Health, PLIBAH) until 1946, when he transferred to the School of Medicine as an assistant professor and head of the Department of Clinical Endocrinology. He also runs the Counseling Center for Diabetics, teaches courses for doctors at the School of Public Health, etc. In 1951 he was elected associate professor at the Faculty of Medicine in Zagreb for the subject of endocrinology at the Department of Internal Medicine. In addition to extensive organizational and pedagogical work in the profession, he was intensively engaged in scientific work.