Moisés Chediak Ahuayda and Alejandro Chediak Ahuayda were Cuban hematologists and serologists from Lebanese descent

 Moisés Chediak Ahuayda (Santiago de Cuba 06 January 1903 – Miami, USA 02 March 1993) 

Described the Chediak-Higashi disease despite the fact that the disease was discovered by Cuban A. Beguez Cesar in 1943

Chédiak, M. Nouvelle anomalie leucocytaire de caractere constitutionelle et familial. Rev. Hematologie 7:362-367, 1952.

Alejandro Chediak Ahuayda (23 October 1904 – Miami, USA 13 March 1996)

Developed the Chediak test for syphilis serum diagnosis using only one drop of blood 

Chediak, A. El diagnostico de la sifilis practicado en una gota de sangre desecada y desfibrinada. Arch.Med.Inf. 1:3-14, 1932. 

Published Quick hemo micro-diagnosis for blood typing, Rh typing and syphilis, performed at the same time with a single drop of the blood, using antigens and original equipment. 1953. 

Patented Apparatus for laboratory investigations. US Patent 2561339. July 24, 1951.