PARIS, July 31 (Reuters) - China's anti-doping agency (CHINADA) has accused the New York Times ( NYT ) of politicizing doping issues and said the publication was trying to "affect the psychology" of Chinese athletes at the Paris Olympics.

CHINADA said it strictly follows anti-doping guidelines and condemned the Times as "unfair and immoral" a day after the newspaper reported two of the country's swimmers in 2022 tested positive for a banned steroid but had their provisional suspensions lifted.

The suspensions were lifted after the positive tests were blamed on contaminated food, and the Times said one of the two swimmers was competing at the Paris Games.

"(The New York Times' ( NYT )) main purpose is to disrupt the order of the Paris Olympic swimming competition, affect the psychology of Chinese athletes and weaken their competitive ability," CHINADA said in a statement on Wednesday.

"This is extremely unfair and immoral."

Asked for comment, a spokesperson for the New York Times ( NYT ) responded: "We are confident in the accuracy of our reporting."

The Times' report ratcheted up already high tensions between the World Anti-Doping Agency and the U.S. anti-doping body over the handling of a case involving 23 Chinese swimmers who tested positive for trimetazidine (TMZ) weeks before the Tokyo Games.

Those positives were also blamed on contamination.

U.S. Anti-Doping Agency chief Travis Tygart said on Tuesday that China had "swept this positive test for a hard-core steroid under the rug."

CHINADA said "doping contamination in meat products is a common problem worldwide" and mentioned the case of American sprinter

Erriyon Knighton

in its statement.

World silver medalist Knighton was not suspended for testing positive for a banned substance, trenbolone, earlier this year after an arbitrator found the result was likely caused by contaminated meat, and he will compete in Paris.

"Relevant research shows that trenbolone is a protein anabolic preparation that has a strong effect of improving strength and explosive power, and is not a common contaminant," CHINADA said.

Reached for comment, USADA said: "The reason that CHINADA can comment on the Knighton case is because we followed the mandatory rules on transparency, unlike what they failed to do when sweeping the TMZ 23 and now the metandienone cases under the carpet."

The U.S. agency said CHINADA had operated contrary to world anti-doping code, and said it had taken the Knighton case to arbitration after giving the sprinter a provisional suspension.

"The arbitrator ruled in Knighton's favour based on him specifically proving the meat at the restaurant where he ate was contaminated with trenbolone, not based on a general claim of contamination," USADA said.