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Prevalence and Dynamics of SARS-CoV-2 Antibodies in the Population of St. Petersburg, Russia.
Parshina, Ekaterina V; Zulkarnaev, Alexey B; Tolkach, Alexey D; Ivanov, Andrey V; Kislyy, Pavel N.
  • Parshina EV; Nephrology and Dialysis Department, Saint Petersburg State University Hospital, 154, Fontanka Emb., Saint-Petersburg, 198103, Russian Federation. e.parshina@spbu.ru.
  • Zulkarnaev AB; Surgical Department of Transplantology and Dialysis, M.F. Vladimirsky Moscow Regional Research Clinical Institute, 61/2, Shchepkina Str., Moscow, 129110, Russian Federation.
  • Tolkach AD; Nephrology and Dialysis Department, Saint Petersburg State University Hospital, 154, Fontanka Emb., Saint-Petersburg, 198103, Russian Federation.
  • Ivanov AV; Human Genetics Department, Saint Petersburg State University Hospital, 154, Fontanka Emb., Saint-Petersburg, 198103, Russian Federation.
  • Kislyy PN; Polyclinic Department №4, Saint Petersburg State University Hospital, 154, Fontanka Emb., Saint-Petersburg, 198103, Russian Federation.
J Epidemiol Glob Health ; 12(2): 206-213, 2022 06.
Article in English | MEDLINE | ID: covidwho-1872834
ABSTRACT

BACKGROUND:

The aim of the study was to assess the prevalence of seropositive status for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-IgA, -IgM, and -IgG; its dynamics in connection with restrictive measures during the coronavirus disease (COVID-19) pandemic; and the quantitative dynamics of antibody levels in the population of St. Petersburg, Russia.

METHODS:

From May to November 2020, a retrospective analysis of Saint Petersburg State University Hospital laboratory database was performed. The database included 158,283 test results of 87,067 patients for SARS-CoV-2 detection by polymerase chain reaction (PCR) and antibody detection of SARS-CoV-2-IgA, -IgM, and -IgG. The dynamics of antibody level was assessed using R v.3.6.3.

RESULTS:

The introduction of a universal lockdown was effective in containing the spread of COVID-19. The proportion of seropositive patients gradually decreased; approximately 50% of these patients remained seropositive for IgM after 3-4 weeks; for IgG, by follow-up week 22; and for IgA, by week 12. The maximum decrease in IgG and IgA was observed 3-4 months and 2 months after the detection of the seropositive status, respectively.

CONCLUSIONS:

The epidemiological study of post-infection immunity to COVID-19 demonstrates significant differences in the dynamics of IgA, IgM, and IgG seropositivity and in PCR test results over time, which is linked to the introduction of restrictive measures. Both the proportion of seropositive patients and the level of all antibodies decreased in terms of the dynamics, and only approximately half of these patients remained IgG-positive 6 months post-infection.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Cohort study / Diagnostic study / Observational study / Prognostic study Topics: Variants Limits: Humans Language: English Journal: J Epidemiol Glob Health Year: 2022 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Cohort study / Diagnostic study / Observational study / Prognostic study Topics: Variants Limits: Humans Language: English Journal: J Epidemiol Glob Health Year: 2022 Document Type: Article