[Fertility and the crossing system in Vibrio cholerae]

A system of crossing of 2 biotypes of cholera strains and nonagglutinating vibrios was worked out by means of modified Parker and Romig's method. The most frequent inheritance of the sex factor was noted in conjugation of strains belonging to the classic biotype. Inheritance of chromosomal genes (pur) was less incident. Sex pili 9 to 10 nm in diameter were revealed in donor V. cholerae 569 (B) P+ strain.