One propaganda tactic used by the communist news media was to claim that the United Nations was using germ warfare on the Koreans

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To substantiate the claims, the Communists instituted a nationwide inoculation campaign and published "scientific" papers from the ministry of agriculture and health

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Chapter 6 North Korean / Communist Chinese Pswar

Psywar
Psychological warfare in Korea
1950-1953
Stephen E Pease

Stackpole Books

Fake vaccines to protect against fake germ warfare