Columbia Encyclopedia

(Encyclopedia) ehrlichiosis ârlĭkēōˈsĭs [key], any of several diseases caused by rickettsia of the genera Ehrlichia and Anaplasma. Ehrlichiosis is transmitted by ticks. Both human forms tend to develop about n...

(Encyclopedia) chikungunya chĭkən-go͞onˈyä [key], viral disease transmitted by the bite of an infected female Aedes mosquito. Symptoms appear after an incubation period of four to eight days and include sudden ...

(Encyclopedia) cryptosporidium krĭpˌtōspərĭdˈēəm [key], genus of protozoans having at least four species; they are waterborne parasites that cause the disease cryptosporidiosis. One of the species appears to...

(Encyclopedia) Parkinsonism: see Parkinson's disease. ...

(Encyclopedia) chancroid: see sexually transmitted disease. ...

(Encyclopedia) Neher, Edwin, 1944–, German biophysicist, Ph.D. Technical Univ. of Munich, 1970. He has been a researcher at the Max Planck Institute for Biophysical Chemistry, Göttingen, Germany, since 1972. Nehe...

(Encyclopedia) clubroot, disease of cabbages, turnips, radishes, and other plants belonging to the family Cruciferae (or Brassicaceae; mustard family). It is induced by a plasmodial slime mold that attacks the roots...

(Encyclopedia) Houghton, Michael, 1949–, Canadian biochemist, Ph.D. King's College, London, 1977. He joined G.D. Searle & Co. in 1977, then became (1982) a researcher at the Chiron Corp. In 2007 Houghton was a...

(Encyclopedia) Henderson, Donald Ainslie, 1928–2016, American physician instrumental in eradicating smallpox, b. Lakewood, Ohio, M.D. Univ. of Rochester, 1954, M.P.H. Johns Hopkins, 1960. He joined (1955) the Epid...

(Encyclopedia) typhus, any of a group of infectious diseases caused by microorganisms classified between bacteria and viruses, known as rickettsias. Typhus diseases are characterized by high fever and an early onset...