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Updated: May 4, 2026
Particle Agglutination Method for Poliovirus Identification
Published on: April 20, 2011
Community circulation patterns of oral polio vaccine serotypes 1, 2, and 3 after Mexican national immunization weeks
Stephanie B Troy1, Leticia Ferreyra-Reyes, Chunhong Huang
1Eastern Virginia Medical School, Norfolk, Virginia.
Background:
With wild poliovirus nearing eradication, preventing circulating vaccine-derived poliovirus (cVDPV) by understanding oral polio vaccine (OPV) community circulation is increasingly important. Mexico, where OPV is given only during biannual national immunization weeks (NIWs) but where children receive inactivated polio vaccine (IPV) as part of their primary regimen, provides a natural setting to study OPV community circulation.
Methods:
In total, 216 children and household contacts in Veracruz, Mexico, were enrolled, and monthly stool samples and questionnaires collected for 1 year; 2501 stool samples underwent RNA extraction, reverse transcription, and real-time polymerase chain reaction (PCR) to detect OPV serotypes 1, 2, and 3.
Results:
OPV was detected up to 7 months after an NIW, but not at 8 months. In total, 35% of samples collected from children vaccinated the prior month, but only 4% of other samples, contained OPV. Although each serotype was detected in similar proportions among OPV strains shed as a result of direct vaccination, 87% of OPV acquired through community spread was serotype 2 (P < .0001).
Conclusions:
Serotype 2 circulates longer and is transmitted more readily than serotypes 1 or 3 after NIWs in a Mexican community primarily vaccinated with IPV. This may be part of the reason why most isolated cVDPV has been serotype 2.
Insights
Oral polio vaccine (OPV) serotype 2 spreads more readily and persists longer in communities primarily vaccinated with inactivated polio vaccine (IPV). This finding helps explain the prevalence of serotype 2 in circulating vaccine-derived poliovirus (cVDPV) cases.
Area of Science:
- Virology
- Epidemiology
- Public Health
Background:
- Preventing circulating vaccine-derived poliovirus (cVDPV) is crucial as wild poliovirus nears eradication.
- Mexico's vaccination strategy, using inactivated polio vaccine (IPV) primarily and oral polio vaccine (OPV) during national immunization weeks (NIWs), offers a unique study setting.
Purpose of the Study:
- To investigate the community circulation and duration of OPV shedding in Mexico.
- To determine if specific OPV serotypes exhibit different transmission dynamics in a population with high IPV coverage.
Main Methods:
- Monthly stool sample collection from 216 children and contacts in Veracruz, Mexico, over one year.
- Analysis of 2501 stool samples using RNA extraction, reverse transcription, and real-time PCR for OPV serotypes 1, 2, and 3.
Main Results:
- OPV was detected up to 7 months post-NIW, with 35% of samples from recently vaccinated children and 4% from others testing positive.
- While all serotypes were shed after direct vaccination, 87% of OPV acquired through community spread was serotype 2 (P < .0001).
Conclusions:
- Serotype 2 OPV demonstrates prolonged circulation and enhanced transmission compared to serotypes 1 and 3 in this IPV-vaccinated community.
- The increased transmissibility and persistence of serotype 2 may explain its predominance in cVDPV outbreaks.
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