Importance: The Sabin-strain inactivated poliovirus vaccine (IPV) may be a tool for polio outbreak response in certain situations.
Objective: To investigate the response to a type 2 vaccine-derived poliovirus (VDPV2) outbreak.
Design, Setting, And Participants: This case series was conducted in China after a VDPV2 was detected in stool specimens from a child with acute flaccid paralysis (AFP) in Sichuan Province in 2019, 3 years after the global withdrawal of live, attenuated type 2 oral poliovirus vaccine (OPV). Investigation followed National Health Commission and World Health Organization guidance and included searching hospitals for unreported AFP cases; testing stool specimens from the child, his contacts, and local children; enhanced environmental surveillance for VDPV2s in wastewater; and measuring vaccination coverage. Sabin-strain IPV campaigns were conducted in a wide geographic area.
Main Outcomes And Measures: Any VDPV2 detection after completion of the supplementary immunization activities.
Results: A 28-nucleotide-change VDPV2 was isolated from a young boy. Three VDPV2s were detected in healthy children; 2 were contacts of the original child, and none had paralysis. A search of 31 million hospital records found 10 unreported AFP cases; none were polio. No type 2 polioviruses were found in wastewater. Prior to the event, polio vaccine coverage was 65% among children younger than 5 years. Sabin-strain IPV campaigns reached more than 97% of targeted children, administering 1.4 million doses. No transmission source was identified. More than 1 year of enhanced poliovirus environmental and AFP surveillance detected no additional VDPVs.
Conclusions And Relevance: These findings suggest that the circulating VPDV2 outbreak in 2019 was associated with low vaccine coverage. An investigation discovered 3 infected but otherwise healthy children and no evidence of the virus in wastewater. Following Sabin-strain IPV-only campaigns expanding from county to prefecture, the poliovirus was not detected, and the outbreak response was considered by an expert panel and the World Health Organization to have been successful. This success suggests that the Sabin-strain IPV may be a useful tool for responding to circulating VDPV2 outbreaks when high-quality supplementary immunization activities can be conducted and carefully monitored in settings with good sanitation.
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http://dx.doi.org/10.1001/jamanetworkopen.2022.49710 | DOI Listing |
China CDC Wkly
December 2024
National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases (NITFID), National Immunization Programme, Chinese Center for Disease Control and Prevention, Beijing, China.
Introduction: Domestic Sabin-strain inactivated poliovirus vaccine (sIPV) was approved for use in China in 2015 and introduced into the national immunization schedule in a sequential schedule with oral poliovirus vaccine (OPV) in May 2016. However, a comprehensive analysis describing the characteristics, occurrences, and incidences of adverse events following immunization (AEFI) with sIPV in China is lacking.
Methods: Data on sIPV doses administered and AEFI reported from 2015 to 2022 were obtained from the Chinese National Immunization Information System (CNIIS).
The article is devoted to the problems of implementation of the WHO Global Polio Eradication Initiative. The influence of the features of poliovirus infection and poliovirus vaccines on the course of the program, its successes and difficulties is considered, the issue of possibility of eradication this infection is discussed.
View Article and Find Full Text PDFPan Afr Med J
December 2024
World Health Organization, Expanded Programme on Immunization, Maternal Child Health and Nutrition, Addis Ababa, Ethiopia.
Introduction: following the detection of vaccine-derived poliovirus in 2019 in Ethiopia, response activities have been conducted including strengthening disease surveillance activities.
Methods: trend analysis study design of acute flaccid paralysis and measles surveillance data for the years 2021 and 2022 for Southwest Ethiopia Region was used. The non-polio acute flaccid paralysis (AFP) rate and stool adequacy rates were used to assess the AFP surveillance.
BMC Infect Dis
December 2024
Department of Environmental Health, School of Community Health Sciences, Njala University, PMB, Freetown, Sierra Leone.
Background: Polio, a debeilitating and potentially life-threatening disease, continues to pose a risk to young children globally. While vaccination offers a powerful shield, its reach is not always equal. This study explores socioeconomic and geographical inequalities in polio immunisation coverage among two-year-olds in Sierra Leone between 2008 and 2019.
View Article and Find Full Text PDFJ Appl Microbiol
December 2024
Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology.
Enteroviruses (EV) are a highly diverse group of viruses multiplying primarily in the gastrointestinal tract and/or the upper respiratory tract, initially distributed in two separate genera: Enterovirus and Rhinovirus, respectively. According to the similarities in genome organization and particle structure, rhinovirus species were later reclassified as also belonging to genus Enterovirus. Human EV infections are usually asymptomatic or causing mild clinical manifestations.
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