Because of significant reduction in delivery of recommended childhood immunization during the pandemic, there is a risk for resurgence of vaccine preventable infections, including measles, pertussis, and polio, which can result in significant morbidity and mortality in children, reported Amy G. Feldman, MD, of Children’s Hospital Colorado, Aurora, and associates.
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Will loss of herd immunity lead to vaccine deserts?
When asked to comment, pediatric infectious disease specialist Christopher J. Harrison, MD, said, “My concern is that we may see expansion of what I call ‘vaccine deserts.’ Vaccine deserts occur in underserved communities, areas with pockets of vaccine-hesitant families or among selected groups with difficult access to health care. These vaccine deserts have held a higher density of vulnerables due to low vaccine uptake, often giving rise to outbreaks of vaccine-preventable diseases, e.g., measles, mumps, pertussis. They are usually due to an index case arriving from another vaccine desert (a developing country or a developed country, U.S. or foreign) where the disease is still endemic or pockets of vaccine hesitancy/refusal exist. When detected, local outbreaks result in rapid responses from public/private health collaborations that limit the outbreak. But what if vaccine deserts became more generalized in the U.S. because of loss of vaccine-induced herd immunity in many more or larger areas of our communities because of pandemic-driven lack of vaccinations? That pandemic-driven indirect damage would further stress the health care system and the economy. And it may first show up in the older children whose vaccines were deferred in the first 4-6 months of the pandemic.”
Dr. Feldman and associates cited findings from a collaborative survey conducted by UNICEF, the World Health Organization, Gavi the Vaccine Alliance, the CDC, the Sabin Vaccine Institute, and the Johns Hopkins Bloomberg School of Public Health, which found that immunization programs experienced moderate to severe disruptions or terminations in at least 68 of 129 low and middle-income countries surveyed. According to the WHO, CDC, Red Cross, and GAVI, 94 million people presently are estimated to be at risk as a consequence of not receiving their measles vaccines following the suspensions.
“These national and international declines in routine immunizations have placed the global community at significant risk for outbreaks of vaccine-preventable infections (VPIs) including measles, polio, and pertussis, diseases which are more deadly, more contagious and have a higher reproductive factor (R0) amongst children than COVID-19,” the authors observed.
Dr. Feldman and associates outlined the horrible devastation that these VPI can cause in children, including significantly higher morbidity and mortality than adults, especially among those with immunodeficiencies. Neurologic deficits, paralysis, intellectual disabilities, and vision and hearing loss are just some of the permanent effects conveyed. “It is concerning to imagine how measles could spread across the United States when social distancing restriction[s] are relaxed and unvaccinated children return to school and usual community engagement,” they noted.