Evidence of oxidative stress can appear under other conditions, including exposure to certain environmental pollutants or infections in the urinary genital tract.

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It may be provoked by infection with Chlamydia trachomatis, a sexually transmitted denizen of the genital tract, and Ureaplasma urealyticum and Mycoplasma fermentans, two other inhabitants of the genitals.

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Mr Dilly Anumba, a consultant obstetrician at Sheffield University who has recently published work showing that TLRs are present in the female genital tract, said Professor Bennett's theories were logical and well worth pursuing.

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