LONDON, (Reuters) - They can make test-tube babies, grow human eggs in a lab and reproduce mice from frozen testicle tissue, but when it comes to knowing how a mans sperm can swim to, find and fertilize an egg, scientists are still floundering.
FILE PHOTO: Doctor Katarzyna Koziol injects sperm directly into an egg during in-vitro fertilization (IVF) procedure called Intracytoplasmic Sperm Injection (ICSI) at Novum clinic in Warsaw, Poland October 26, 2010. REUTERS/Kacper Pempel /File Photo
Enormous advances in treating infertility in recent decades have helped couples conceive longed-for offspring they previously would not have had.
Yet this progress has also been a work-around for a major part of the problem: Sperm counts are falling drastically worldwide - and have been doing so for decades and scientists say their honest answer to why is: We dont know.
Infertility is a significant global health problem, with specialists estimating that as many as one in six couples worldwide are affected. In more than half of those cases, experts say, the underlying problem is in the male.
Most of the focus of infertility research has been on women, however: on what can reduce their fertility and on how ...