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Horizonte Médico (Lima)
Print version ISSN 1727-558X
Abstract
PAREJA CRUZ*, Arturo et al. Humoral immune response to four SARS-CoV-2 vaccines in healthcare professionals. Horiz. Med. [online]. 2022, vol.22, n.2, e1937. Epub July 07, 2022. ISSN 1727-558X. http://dx.doi.org/10.24265/horizmed.2022.v22n2.06.
Objective:
To describe the concentration of neutralizing antibodies in serum from healthcare professionals who received any of the SARS-CoV-2 vaccines developed by Sinopharm, Pfizer or Johnson & Johnson, or CureVac’s vaccine candidate.
Materials and methods:
An observational, descriptive, retrospective, cross-sectional research which included 217 healthcare professionals fully vaccinated with Sinopharm, Pfizer or Johnson & Johnson’s vaccines, or CureVac’s vaccine candidate. The presence of anti-SARS-CoV-2 neutralizing antibodies in serum was determined in these individuals using the electrochemiluminescence immunoassay (ECLIA). Variables such as age, sex, history of infection with SARS-CoV-2, concentration of neutralizing antibodies and brand of vaccine administered were considered.
Results:
Sixteen point six zero percent (16.60 %) of the healthcare professionals stated that they had already had COVID-19 before receiving the vaccine. They were immunized with the vaccines developed by Sinopharm (74.65 %), Pfizer (12.90 %) or Johnson & Johnson (5.07 %), or CureVac’s vaccine candidate (7.37 %). Regardless of the vaccine received, 42.50 % of the individuals who had not been previously infected with SARS-CoV-2 and 16.70 % of those who had been previously infected did not develop neutralizing antibodies. Pfizer’s vaccine produced the highest concentration of neutralizing antibodies (196.27 AU/mL) in patients with or without previous infection.
Conclusions:
The study demonstrates that vaccination boosts immunity in people previously infected with the novel coronavirus and suggests that Pfizer’s vaccine produces the highest concentration of neutralizing antibodies.
Keywords : Antibodies, Neutralizing; Coronavirus Infections; Immunogenicity, Vaccine; Vaccination.