Chernova had already been given two-year ban backdated to 2013 from a 2009 positive test, but CAS has now decided every one of her results between August 15, 2011, and July 22, 2013 are cancelled.
CAS ruled on Tuesday that all of Chernova's results between August 15, 2011, and July 22, 2013, are annulled.
Ennis-Hill won world titles in 2009 and 2015 (Berlin and Beijing respectively) and Olympic gold in London ahead of Chernova.
In response to the news, Ennis-Hill posted a photograph on her Instagram account of Chernova celebrating after the final event of the 2011 heptathlon, the 800m. However much it drove me on for what I was about to achieve at my first Olympics in London, in my heart I just knew it was wrong. "Triple World Champion WOW".
"We have always known that Jess was the 2011 world champion, so it is nice to be able to finally be able to say it in public", Ennis-Hill's coach Toni Minichiello was quoted as saying by Britain's Guardian. All three athletes have been found to have committed an Anti-doping Rule Violation (ADRV) pursuant to Rule 32.2 of the International Athletics Federation (IAAF) Competition Rules after analysis of their Athlete Biological Passports (ABP) showed evidence of blood doping.
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He said that when Morano was young, she seemed to be fragile, and none of her friends expected she would outlive them. She followed a stringent diet of two raw eggs, one cooked egg, a little minced meat and pasta for the past 90 years.
"A CAS statement read:" Tatyana Chernova is sanctioned with a period of ineligibility of three years and eight months, beginning on 5 February 2016.
As a outcome of the CAS ruling, Germany's Jennifer Oeser is set to be promoted from her third place finish while Polish athlete Karolina Tyminska will now be given a bronze medal from the 2011 championships. CAS said her previous two-year ban would be deducted from the sanction. That would include her gold medal at the 2013 University Games in Kazan, Russia.
It comes after Russia's Tatyana Chernova was stripped of her 2011 heptathlon title for doping.
Sharmina will be banned for three years from December 7, 2015, and Ugarova for two years, beginning September 7, 2015.