[[File:K F. Meyer Portrait1.JPG|thumb|250px|Karl Friedrich Meyer (1884-1974) <br /> "The of the 20th century"]]
Karl Friedrich Meyer (19 May 1884–27 April 1974) was an American scientist of [[Switzerland|Swiss]] origin. He was one of the most prodigious scientists in many areas of infectious diseases in man and animals, the [[ecology]] of [[pathogen]]s, [[epidemiology]] and [[public health]][1-6]. Some called him the “ of the 20th century”.ref== Early Life, Education ==
Meyer was born in [[Basel]] (Switzerland) to Theodor Meyer, 1852–1934, (a „Meyer zum Pfeil”), international cigar merchant, and Sophie, née Lichtenhahn, teacher, 1857-1936. Karl Friedrich had two younger sisters.
Meyer began his studies in 1902 at the [[University of Basel]] and soon moved to the [[University of Zurich]] where he concentrated on [[biology]], [[zoology]], [[histology]], and laboratory techniques. He was greatly fostered by [[Heinrich Zangger]], professor of [[comparative anatomy]] (and later the first professor of [[Medical Law]] in Zurich), who sent him to work with leading scientists in [[Munich]] and [[Bern]].ref Meyer was deeply impressed and influenced by Zangger's social consciousness. He received a doctorate of veterinary medicine in 1909 from the University of Zurich. – Later, in 1924, Meyer spent a sabbatical leave from the [[University of California]] in Zurich and obtained a Ph.D. in Bacteriology from the University of Zurich.
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=== Botulism ===
Meyer started his work on [[botulism]] after 1913, when [[home canning]] became popular during the war, and sterilization techniques were not sufficient. Around 1920, the entire canning industry in California (whose business in canned food then amounted to almost a billion dollars) was in jeopardy because many deaths occurred throughout the country due to lack of proper sterilization in the canneries. Meyer then convinced the [[National Canners Association]] to fund research and development of safe industrial processes. Owing to Meyer, a research institute was founded, financed by the canning industries, and directed by him from 1926 to 1930. A canning research laboratory existed in the Hooper until the 1980s. Meyer continued consulting with the industries until his death. Thus, he deserves the credit for developing safe canning procedures, for realizing effective control over industrial hygiene, and for the prevention of botulism.
=== Equine encephalitis ===
Meyer also investigated what are called [[arbovirus]] diseases, among them . Several diseases transmitted from animals to humans are due to a group of viruses [[Mosquito-borne disease|carried by mosquitoes]]. Mosquitoes belong to the ‘animal family’ (technically a ‘[[phylum]]’) called [[arthropods]]; hence the viruses carried by them are arthropod-borne. Different arboviruses may cause diverse diseases. Here, we summarize examples of Meyer’s outstanding discoveries in this area.