The marathon world record-holder, who has not raced since November 2009 following the birth of her second child, Raphael, had been due to compete in the 10km Bupa Great Manchester Run on May 15.
But she has been forced to pull out after suffering breathing difficulties while training at her high-altitude base in the French Pyrenees. Health permitting, her first competitive outing will now be another 10km road race, the Bupa London 10,000, on May 30.
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