The report about the North's testing of anthrax came after the US published its National Security Strategy, a document that said Pyongyang was "pursuing chemical and biological weapons which could also be delivered by missile".
The Director of Press of the Institute for American Studies of North Korea Ministry of Foreign Affairs said in a statement that such accusation is another example of the U.S. habit to pander fiction as "truth", Xinhua news agency reported.
A former US government official was also quoted as saying USA troops in South Korea have been vaccinated against smallpox and anthrax since 2004 because "Washington had apparently been aware for some time that North Korea is culturing anthrax".
"Properly speaking, it is the USA stereotyped method to cook up untruths as truths, stubbornly insisting that black is white and fabricating anything for satisfying their aggressive greed", a statement from the Korean Central News Agency read.More news: Google finally gives more Android phones their own Assistant
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It recollected when USA troops openly used biological weapons during the Korean War and inflicted needless suffering on innocent civilians.
The threat of an impending war with North Korea intensified after the country's state television reported last month it launched a new intercontinental ballistic missile, Hwasong 15, which is a nuclear-capable weapon that could reach the entire continental U.S.
The North was also thought to be among the world's largest possessors of chemical weapons, ranking third after the United States and Russian Federation, according to the Nuclear Threat Initiative (NTI), a non-profit organization aiming at protecting lives and the environment from nuclear, biological, radiological, chemical, and cyber dangers. A report by Harvard Kennedy School's Belfar Center for Science and International Affairs stated the dictatorship may have "anthrax and smallpox" pathogens that could be turned into weapons. Nuclear-armed North Korea said on August 30 that it had fired a missile over Japan the previous day, the first time it has ever acknowledged doing so.
Nuclear attacks aren't the only thing to worry about from North Korea.
The report said the testing involves ensuring anthrax survives the vast temperatures generated during re-entry into the Earth's atmosphere.