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Gaceta Médica Boliviana

Print version ISSN 1012-2966On-line version ISSN 2227-3662


LIMACHI CHOQUE, Jhonny Wilson  and  VERDUGUEZ-ORELLANA, Aleida. Post-vaccination Anti SARS-CoV-2 Antibodies in Cochabamba, Bolivia. Gac Med Bol [online]. 2022, vol.45, n.1, pp.29-35. ISSN 1012-2966.

Neutralizing antibodies (NAbs) against SARS-CoV-2 are being evaluated in humans. The specific adaptive responses of asymptomatic or symptomatic subjects against SARS-CoV-2 antigen show a positive correlation with the humoral immune response.


To evaluate the presence of antibodies against spike specific protein (RBD, receptor binding domain of spike protein) and NP (nucleoprotein) of SARS-CoV-2 virus in people who received anti-COVID-19 vaccines used in Bolivia.


During 2021 between July and August, a cross-sectional observational study was carried out in 150 persons of both sexes who were recruited in the Hospitals: Caja de Seguro Social Militar and Caja Nacional de Salud, to detect specific antibodies against the NP and RBD proteins of the SARS-CoV-2 virus responsible for COVID-19, by means of a qualitative immunochromatographic test.


The presence of neutralizing antibodies after the administration of vaccines against SARS-CoV-2, as complete scheme, first dose, and/or history of infection, was found in 61 % of the persons grouped in the category "low occupational risk" in a heterogeneous way regarding RBD antibodies, NP or both together.


The production of antibodies against the specific protein of the RBD and NP spike of the SARS-CoV-2 virus shows a heterogeneous response due to several factors such as, type of vaccine, number of doses, infection by COVID-19, antibody decline over time, sensitivity of the test and intrinsic properties of the person evaluated.

Keywords : SARS-CoV-2; antibodies; vaccines.

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