Achieving high immunogenicity against poliovirus with fractional doses of inactivated poliovirus vaccine in Ecuador-results from a cross-sectional serological survey by Trueba, Gabriel, Jeyaseelan, Vishali, Lopez, Lazaro, Mainou, Bernardo A., Zhang, Yiting, Whittembury, Alvaro, Valarezo, Alfredo Jose Olmedo, Baquero, Gonzalo, de Aguinaga, Rosa Romero, Salinas, Lucia Jeannete Zurita, Mancheno, Maria Gabriela Santacruz, Chacho, Diana Elizabeth Medina, Quentin, Emmanuelle, Chevez, Ana Elena, Rey-Benito, Gloria, Mach, Ondrej

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