Juan Nicolás Davalos Betancourt, Cuban bacteriologist (Juan Gualberto Gómez, Matanzas Province 06 November 1857 – La Habana 04 December 1910)

Showed Pasteurella as causative agent of moquillo or avian diphtheria in Cuba

La difteria aviaria in Cuba (1904)

With E. Acosta Mayor developed an improved procedure of Emile Roux for production of antidiphtheria vaccine (praised by Roux)

Obtained sera against tetanus, typhoid fever, anthrax and many animal diseases

Discovered higadillo and its causative agent in chickens

Etiologia del higaldillo (1888)

Modified the Ziehl’s solution for fast staining of microorganisms

Metodo de coloración rapida de los germenes (1892)

Developed a new procedure for diagnosis of diphtheria (1893)

El diagnostico bacteriologico da difteria (1897)

Authored Aumento de la virulencia del micróbio del muermo por la temperatura media del pais (1890), reproduced by The Lancet

Idealized a new procedure for bacteriological diagnosis of leprosy

Diagnostico bacteriologico de la lepra (1889)

Proposed coconut water as culture medium for distinct microbes

Contribución del estudio del agua de coco como medio de cultivo de diferentes gérmenes patogenos Cron. Med. Quir. La Habana (1892)

Concluded that Cuban tobacco displayed less nicotine that others produced in the world

Notas sobre la fermentación del tabaco. Cron. Med. Quir. La Habana 18, 1892

LINKS (Spanish)

http://www.revmedicaelectronica.sld.cu/index.php/rme/article/view/2958/html_657

http://files.sld.cu/digitalizacion-bmn/files/2018/05/0045-9178.1967.0035.0018.pdf