reported Saturday, citing unnamed sources, that Baptiste had tested positive for a banned substance, although Trinidad and Tobago team manager Dexter Voisin would not confirm that to the Express.
"She has voluntarily withdrawn from the competition and is heading back to her base," Voisin told the newspaper.
Pressed regarding the positive test report, he said, "I can't disclose anything pertaining to that."
Two days later, the Trinidad and Tobago's National Association of Athletics Administrations (NAAA), who initially declined to give a reason, issued a statement
Monday confirming that Baptiste's withdrawal was "related to doping matters."
The "association was notified on August 8 by the IAAF" of the case, adding it was "premature and inappropriate" to comment further since the case was ongoing.
The 26-year-old Baptiste set a national record of 10.83 seconds in June, making her the third-fastest woman in the world this year, trailing only two-time Olympic champion Shelly-Ann Fraser-Pryce of Jamaica and Nigeria's Blessing Okagbare, AFP
The 2011 bronze medalist had been scheduled to compete in the 100, 200 and as part of her homeland's 4x100m relay team in Moscow.
Baptiste now joins Tyson Gay, Asafa Powell, Veronica Campbell-Brown and Sherone Simpson as high-profile athletes who have tested positive for banned substances.
In fact, Baptiste is from the same training group as former world champion Gay of the United States, who returned two positive tests for an undisclosed banned substance.
Gay also withdrew from the 2013 track and field world championships in Moscow.