US officially added to WHO list of countries affected by poliovirus outbreak
US officially added to WHO list of countries affected by poliovirus outbreak
The vast majority of the American population is vaccinated against poliomyelitis and well protected against this dangerous disease. The CDC recommends that children receive three doses of the inactivated polio vaccine at 24 months, followed by a fourth dose between ages 4 and 6. But vaccination rates have dropped in recent years, and small pockets of states and counties may have incredibly low coverage. For example, in Rockland County, just northeast of New York, the vaccination rate for 2-year-olds was 67% in 2020, but has slipped to 60% now. And according to ZIP code-level vaccination data, one area in Rockland County has a vaccination rate as low as 37%, with a few others in the 50s.
Vaccination challenges
Polio is a particularly big target for anti-vaccine misinformation. Much of the poliovirus currently circulating in the world today, including the United States, is derived from oral vaccines, which use live and weakened polioviruses to boost immunity. Oral polio vaccines are highly effective in protecting against paralytic polio and are safe and affordable. But, if used in areas with low vaccination rates, harmless and immunizing vaccine viruses can spread to others due to poor sanitation and/or hygiene. If the vaccine continues to move from person to person, it may pick up mutations along the way that allow it to regain the ability to cause infection and paralytic polio. At this point, the vaccine virus is reclassified as vaccine-derived poliovirus (VDPV).
Circulation of VDPV has been gobbled up by dangerous anti-vaccine advocates, such as Robert F. Kennedy Jr. and his organization, Children's Health Defense, who giddily tout the false claim that polio vaccines cause polio. To be clear, polio vaccines are very effective in preventing polio safely. As always, the lack of vaccination against poliomyelitis causes the outbreak of poliomyelitis...
The vast majority of the American population is vaccinated against poliomyelitis and well protected against this dangerous disease. The CDC recommends that children receive three doses of the inactivated polio vaccine at 24 months, followed by a fourth dose between ages 4 and 6. But vaccination rates have dropped in recent years, and small pockets of states and counties may have incredibly low coverage. For example, in Rockland County, just northeast of New York, the vaccination rate for 2-year-olds was 67% in 2020, but has slipped to 60% now. And according to ZIP code-level vaccination data, one area in Rockland County has a vaccination rate as low as 37%, with a few others in the 50s.
Vaccination challenges
Polio is a particularly big target for anti-vaccine misinformation. Much of the poliovirus currently circulating in the world today, including the United States, is derived from oral vaccines, which use live and weakened polioviruses to boost immunity. Oral polio vaccines are highly effective in protecting against paralytic polio and are safe and affordable. But, if used in areas with low vaccination rates, harmless and immunizing vaccine viruses can spread to others due to poor sanitation and/or hygiene. If the vaccine continues to move from person to person, it may pick up mutations along the way that allow it to regain the ability to cause infection and paralytic polio. At this point, the vaccine virus is reclassified as vaccine-derived poliovirus (VDPV).
Circulation of VDPV has been gobbled up by dangerous anti-vaccine advocates, such as Robert F. Kennedy Jr. and his organization, Children's Health Defense, who giddily tout the false claim that polio vaccines cause polio. To be clear, polio vaccines are very effective in preventing polio safely. As always, the lack of vaccination against poliomyelitis causes the outbreak of poliomyelitis...