Medicine2026n = Over 25,000 patients across 47 studies
Systematic ReviewHuman
This systematic review set out to understand how common brain fog and cognitive impairment are in people with long COVID, and how these symptoms play out over time. It pooled…
Frontiers in endocrinology2025n = 2,672 semen samples
CohortHuman
This study asked whether the pandemic changed how sensitive sperm production is to weather. It took 2,672 semen analyses from 1,287 Korean men collected between 2018 and 2024 and matched…
Reproductive sciences (Thousand Oaks, Calif.)2023
Narrative ReviewHuman
This is a narrative review, which means the authors gathered and discussed existing work rather than running a study of their own. It asks whether the damage COVID-19 does to…