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On the 16th, at the World Health Assembly held in Berlin, Germany, the Bill Gates Foundation announced that it will invest 1.2 billion US dollars to end all types of polio worldwide. According to the "Voice of America" report on the same day, the Gates Foundation said that the above-mentioned funds will be used to support the global polio eradication plan, focusing on helping Pakistan and Afghanistan end polio, while avoiding new cases caused by polio virus mutations. epidemic. Previously, the Gates Foundation has donated nearly $5 billion to the Global Polio Eradication Program.

　　Polio, commonly known as polio, is an acute infectious disease caused by poliovirus that seriously endangers children's health. With the joint efforts of the international community, there are only two polio-endemic countries in the world, namely Pakistan and Afghanistan. So far this year, Pakistan has reported 20 polio cases, while Afghanistan has reported two, the Associated Press said. The Associated Press pointed out that since 1988, the international community has invested a huge amount of about 1 billion US dollars in polio eradication every year, but the previous plans for polio eradication have not been achieved. In addition, there have even been cases of vaccine-derived polio transmission in Africa and even the United States, Israel and other countries. For example, the U.S. Centers for Disease Control and Prevention issued a statement in September saying that previously identified cases of polio in New York state met the World Health Organization-defined criteria for "transmission of vaccine-derived poliovirus." According to experts, when the immunity of people living in the same community to poliovirus decreases to a certain level, the attenuated virus in the oral vaccine spreads for a long time, and the virus may undergo genetic mutation, regain infection of the central nervous system and The ability to cause paralysis.

　　Inoculation of young children with polio vaccine is of great significance in eradicating polio. According to UNICEF statistics, by 2021, the polio vaccination rate of young children aged 12-23 months in Afghanistan will be about 75%, and that in Pakistan will be about 83%. Political instability and war have seriously hindered vaccination efforts. In the United States, polio vaccination rates are similarly low in some areas. In August, the ABC said that the state with the lowest polio vaccination rate in the United States was Washington, at 80.4 percent. In addition, there are also media reports that in New York City, the polio vaccination rate in some communities is even less than 60%. The analysis believes that the American society has always had doubts about vaccines and opposition to mandatory vaccination. The recent new crown pneumonia epidemic has had an impact on the normal vaccination work, further reducing the vaccination rate.