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Fertil Steril. 1981 May;35(5):549-51.

Survival of bacteria after freezing of human semen in liquid nitrogen.


Thirty-four semen samples from fertile men were subjected to bacteriologic evaluation before and after freezing to -196 degrees C using 10% glycerol as the protective medium. Cultures of the fresh portions from all ejaculates examined showed the presence of aerobic bacteria. Staphylococcus epidermidis, Corynebacterium sp., alpha-streptococci, and nonhemolytic streptococci were found so commonly that they were considered commensals. Enterococci, Escherichia coli, S. aureus, and beta-hemolytic streptococci group B, as well as Pseudomonas aeruginosa, P. maltophilia, and P. fluorescens, were also recovered from a few semen samples of these fertile men. Practically all bacteria isolated from the fresh ejaculate were also recovered from the portions frozen in liquid nitrogen.

[Indexed for MEDLINE]

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