En utilisant des cellules souches embryonnaires de singe, des scientifiques ont créé des spermatozoïdes fonctionnels chez un animal étroitement apparenté à l'homme.
Selon le CDC, 330 000 cycles de procréation médicalement assistée ont été réalisés en 2019. Mais la pandémie a interrompu ces efforts pour de nombreux couples.
C'est une longue et difficile traversée à la nage de l'appareil reproducteur féminin que les spermatozoïdes mâles effectuent, et de nouvelles recherches jettent un doute sur l'idée que c'est le nageur le plus rapide et le plus fort qui arrive en premier.
Selon les chercheurs, les personnes qui vivent dans des quartiers économiquement défavorisés ont environ 20 % de chances en moins de concevoir, par rapport aux personnes issues de zones disposant de plus de ressources.
De nombreux experts s'inquiètent des "retombées" que les lois sur l'avortement - tant celles qui existent déjà que les propositions futures - pourraient avoir sur les soins et les traitements de fertilité.
Les taux d'infertilité chez les femmes aux États-Unis sont restés à peu près les mêmes au cours des deux dernières décennies, selon une étude publiée ce mois-ci dans la revue Fertility and Sterility.
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