Octave Gengou was born in 1875.
Octave Gengou died in 1957.
Pertussis was discovered by Jules Bordet and Octave Gengou. The vaccine was created by Dr. Louis Sauer.
Jules Bordet (1870-1960) along with Octave Gengou discovered Bordetella pertussis in pure culture in 1906 as the actual cause of whooping cough.
The pathogen that causes whooping cough, Bordatella pertussis, was first isolated in 1906 by Bordet and Gengou. I don't know who was the first poor soul to have the cough drive them crazy, but I suspect that's not what you're asking.
Octave Gréard was born in 1828.
Octave Merlier was born in 1897.
Octave Dua was born in 1882.
Octave Levenspiel was born in 1926.
Octave Garnier was born in 1889.
Octave Uzanne was born in 1851.
Octave Crouzon was born in 1874.
Octave Hamelin was born in 1856.