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This research was supported by public funds obtained in competitive calls: Grant COV20/00021 from the Instituto de Salud Carlos III-Spanish Ministry of Health, and co-financed with Fondo Europeo de Desarrollo Regional (FEDER) funds.

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Pardilla, MbeAuthorMartinez-Perez, OAuthor

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Article

Impact of Recommended Maternal Vaccination Programs on the Clinical Presentation of SARS-CoV-2 Infection: A Prospective Observational Study

Publicated to:Vaccines. 9 (1): 1-10 - 2021-01-01 9(1), DOI: 10.3390/vaccines9010031

Authors: de la Cruz Conty, Maria Luisa; Encinas Pardilla, Maria Begona; Garcia Sanchez, Marta; Gonzalez Rodriguez, Laura; Muner-Hernando, Marta Luisa; Royuela Vicente, Ana; Pintado Recarte, Pilar; Martinez Varea, Alicia; Martinez Diago, Clara; Cruz Melguizo, Sara; Martinez-Perez, Oscar;Spanish Obstet Emergency Grp

Affiliations

‎ Alvaro Cunqueiro Hosp Vigo, Dept Gynecol & Obstet, Pontevedra 36213, Spain - Author
‎ Doctor Josep Trueta Univ Hosp Girona, Dept Gynecol & Obstet, Girona 17007, Spain - Author
‎ Gregorio Maranon Univ Hosp, Dept Gynecol & Obstet, Madrid 28007, Spain - Author
‎ La Fe Univ, Dept Gynecol & Obstet, Valencia 46026, Spain - Author
‎ La Paz Univ Hosp, Dept Gynecol & Obstet, Madrid 28046, Spain - Author
‎ Polytech Hosp, Valencia 46026, Spain - Author
‎ Puerta Hierro Biomed Res Inst IDIPHISA CIBERESP, Biostat Unit, Madrid 28222, Spain - Author
‎ Puerta Hierro Univ Hosp Majadahonda, Dept Gynecol & Obstet, Madrid 28222, Spain - Author
‎ Puerta Hierro Univ Hosp Majadahonda, Fdn Invest Biomed, Madrid 28222, Spain - Author
‎ Quironsalud Malaga Univ Hosp, Dept Gynecol & Obstet, Malaga 29004, Spain - Author
‎ Univ Autonoma Madrid, Dept Obstet & Ginecol, Madrid 28029, Spain - Author
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Abstract

The COVID-19 pandemic has raised questions about the possible cross immunity resulting from common vaccination programs and SARS-CoV-2 infection. Therefore, the Spanish Obstetric Emergency group performed a multicenter prospective study on the vaccination status of Influenza and Tdap (diphtheria, tetanus and pertussis vaccine boost administered in adulthood) in consecutive cases of SARS-CoV-2 infection in a pregnancy cohort, in order to assess its possible association with the clinical presentation and severity of symptoms of SARS-CoV-2 infection, as well as to determine the factors that may affect vaccination adherence. A total of 1150 SARS-CoV-2 positive pregnant women from 78 Spanish hospitals were analyzed: 183 had not received either vaccine, 23 had been vaccinated for Influenza only, 529 for Tdap only and 415 received both vaccines. No association was observed between the vaccination status and the clinical presentation of SARS-CoV-2 infection and/or the severity of symptoms. However, a lower adherence to the administration of both vaccines was observed in the Latin-American subgroup. Based on the results above, we reinforce the importance of maternal vaccination programs in the actual pandemic. Health education campaigns should be specially targeted to groups less likely to participate in these programs, as well as for a future SARS-CoV-2 vaccination campaign.

Keywords

covid 19diphtheria tetanus pertussis vaccineinfluenza vaccinesmaternal immunizationpassive immunizationsars-cov-2Covid 19Diphtheria tetanus pertussis vaccineInfluenza vaccinesMaternal immunizationPassive immunizationPregnancySars-cov-2

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Vaccines due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Drug Discovery.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 3.12, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Jul 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-01, the following number of citations:

  • WoS: 7
  • Scopus: 12
  • Europe PMC: 8

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-01:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 99.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 99 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 2.85.
  • The number of mentions on the social network X (formerly Twitter): 4 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://repositorio.uam.es/handle/10486/697562