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The male infertility crisis is an increase in male infertility since the mid-1970s. [1] The issue attracted media attention after a 2017 meta-analysis found that sperm counts in Western countries had declined by 52.4 percent between 1973 and 2011.
There has been a lot of talk in the past few years about global declines in sperm counts. Recent research found that sperm counts dropped by 1.2% per year on average from 1973 to 2018, with ...
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Men aren’t producing as many sperm as they were decades ago. It’s a trend observed around the globe. The pace of decline is accelerating.
Males from India had a 30.3% decline in sperm count, 22.9% decline in sperm motility, and a 51% decrease in morphology over a span of a decade. Doctors in India disclosed that the sperm count of a fertile Indian male had decreased by a third over a span of three decades. [82]
[3] [4] AZFc deletions have been associated with drastic reduction in sperm count, and there are subsets of men with AZFc microdeletions that experience progressive declines in their sperm count. There are multiple candidate genes in the AZFc region that have been shown to cause infertility in males: Deleted in Azoospermia (DAZ), Chromodomain ...
Put differently, if one person has the average sperm quality and concentration from 50 years ago and another has the average sperm quality and concentration seen today, both of them would be ...
If sperm count remains above 60 million per ejaculate, fertility remains normal. But sperm counts are continuing to drop. At such low levels, the sperm often are incapable of successfully fertilizing the egg. A decline in male fertility often means a decline in natural fertility, as fertility is carried by both sexes.