Albert Ludwig Sigesmund Neisser (January 22, 1855, Schweidnitz - July 30, 1916, Breslau) was a German physician who discovered the causative agent (pathogen) of gonorrhea, a strain of bacteria that was named in his honour.

Neisser was born in the Silesian town of Schweidnitz (now Świdnica, in Poland), the son of a well-known Jewish physician, Dr. Moritz Neisser. After he completed the elementary school in Münsterberg, Neisser enrolled in the St. Maria Magdalena School in Breslau (now Wroclaw, in Poland). In this school, he was a contemporary of another great name in the history of medicine, Paul Ehrlich. He obtained the Abitur (habilitation) in 1872.

Neisser began to study medicine at the University of Breslau, but later moved to Erlangen, completing his studies in 1877. Initially Neisser wanted to be an internist, but he didn't find a suitable place. He found work, however as an assistant of the dermatologist Oskar Simon (1845-1892), concentrating on sexually transmitted diseases and leprosy. During the following two years he studied and obtained experimental evidence about the pathogen for gonorrhea, Neisseria gonorrhoeae. He was only 21 years old.

Neisser was also the co-discoverer of the causative agent of leprosy. In 1879 the Norwegian physician Gerhard Armauer Hansen gave to young Neisser (who had visited him in Norway to examine some 100 leprosy patients) some tissue samples of his patients. Neisser successfully stained the bacteria and announced his findings in 1880, claiming to have discovered the pathogenesis of leprosy. There was some conflict between Neisser and Hansen, because Hansen had failed to culture the organism and demostrante unequivocally its link to leprosy, although he had observed the bacterium since 1832.

In 1882 Neisser was appointed professor extraordinarius by the University at the tender age of 29, and worked as a dermatologist in the university hospital of Breslau. Later he was promoted to the director of the hospital. In the following year he married Toni Neisser, née Hoffmann.

In the years 1905 and 1906 Neisser travelled to Java, in order to study the possible transmission of syphilis from apes to humans. He later cooperated with August Paul von Wassermann (1866-1925) to develop the famous diagnostic test for detecting Treponema pallidum infections, and also in the testing of the first chemotherapeutic agent for syphilis, Salvarsan, which was discovered by his former school fellow Paul Ehrlich in 1910. In 1907, Neisser was promoted to professor ordinarius of dermatology and sexually-transmitted diseases at Breslau.

As a scientific leader, Neisser was also very active. In the field of public health, he promoted vigorously preventive and educational measures to the public, and the better sanitary control of prostitutes, in order to combat venereal diseases. He was one of the founder of the Deutsche Gesellschaft zur Bekämpfung der Geschlechtskrankheiten (German Society for the Fight Against Venereal Diseases) in 1902, and of the Deutsche Dermatologische Gesellschaft (German Dermatological Society) in 1888.

At the age of 61 years, Professor Albert Neisser died of septicemia on July 30th, 1916, in Breslau.

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