Test tube fears

New safety fears have been raised about a controversial IVF technique. It has already been claimed that intracytoplasmic sperm injection (ICSI) doubles the risk of birth defects (This Week, 22 November 1997, p 5). Now a team led by Jennifer Bowen of the University of Sydney says that children conceived by ICSI have “mild delays” in their mental development when they are one year old ( The Lancet, vol 351, p 1529). However,
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