If you have followed recent news, this is information that has probably not escaped you: the rate of spermatozoa in semen is declining all over the world, and this phenomenon has even been accelerating since the 2000s. This is the conclusion of a study widely relayed by the media, published on November 15 in the journal
Human Reproduction Update .
and conducted by Hagai Levine, an Israeli epidemiologist.
This work - which consisted of compiling and analyzing 288 existing studies - even estimates that the concentration of spermatozoa in semen would have fallen from 101 to 49 million spermatozoa per milliliter between the beginning of the 1970s and 2018, i.e. a drop by half.
Remember, however, that above 15 million per millilitre, a sperm concentration is considered normal according to the criteria of the World Health Organization (WHO).
The average rate measured in the study therefore still remains well above the lower limit value.
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