[Seasonal variations of cellular composition of human semen (author's transl)].

Sperm samples taken fortnightly from 14 young europeans over a period of 8 months show evidence of a seasonal variation in the concentration of spermatozoa and in the frequency of abnormal sperm (teratospermy). Both factors are highest in winter and lowest in springtime. A study of 3,000 spermograms established during consultations for sterility over the last 2 years did not clearly reveal the same trends, however, a statistical analysis of the results leads to the conclusion that several hundred examinations per month would be needed to show a significant seasonal variation in such a heterogeneous sample.