A University of Zurich study shows that sperm quality among young Swiss men is holding steady.
The team compared 194 army recruits tested in 2021 with more than 2,500 young men sampled between 2005 and 2017, finding concentration, count, shape and motility broadly unchanged.
Only 41% of the 2021 group fell below World Health Organization guidelines on at least one measure, down from 62% in the earlier sample.
The researchers also found that recruits who had tested positive for Covid-19 in the previous six months showed lower sperm counts, though the effect appears to fade over time.
The findings push back against an international trend of declining sperm quality reported in recent years.
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