In May 1951, the DPRK foreign minister sent the president of the UN General Assembly and the president of the UN Security Council a statement in protest against the U.S. use of germ weapons in the Korean War.

According to the statement, the U.S. imperialist forces spread smallpox in some areas of the northern half of Korea in December 1950, when retreating from those areas.

The number of smallpox cases drastically increased in 1951 in Pyongyang and South and North Phyongan, Kangwon, South Hamgyong and Hwanghae provinces, with 10 percent of them lost their lives.

The U.S. began to use germ weapons on a larger scale from early 1952.

On February 22, 1952, the DPRK foreign minister released a statement of protest against the U.S. forces' spread of pest and cholera germs throughout the DPRK's territory from January 28.

They dropped all sorts of poisonous insects like fly, mosquito, spider, bedbug and flea nearly 10 times in Kangwon Province in less than one month. Those insects were highly resistant to coldness and immune to insecticide.

The U.S. dropped a large quantity of foodstuffs, toys and daily necessities carrying cholera germ in Hwanghae, South Phyongan and Kangwon provinces.

From January 1953, even B-52s were involved in dropping epidemic carriers in most part of the northern half of Korea.

At least 20,000 poisonous insects were scattered on each square meter of Janghang-ri, Hyesan County, South Hamgyong Province.

The U.S. germ warfare was entirely aimed at exterminating the Korean nation.