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Analysis of institutional authors

Fernandez-De-Las-Penas CCorresponding AuthorOrtega-Santiago RAuthorFuensalida-Novo SAuthor

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October 10, 2022
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Differences in Long-COVID Symptoms between Vaccinated and Non-Vaccinated (BNT162b2 Vaccine) Hospitalized COVID-19 Survivors Infected with the Delta Variant

Publicated to:Vaccines. 10 (9): 1481- - 2022-09-01 10(9), DOI: 10.3390/vaccines10091481

Authors: Fernandez-de-las-Penas, Cesar; Ortega-Santiago, Ricardo; Fuensalida-Novo, Stella; Martin-Guerrero, Jose D; Pellicer-Valero, Oscar J; Torres-Macho, Juan

Affiliations

Department of Internal Medicine, Hospital Universitario Infanta Leonor-Virgen de la Torre, Madrid, 28031, Spain, Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, 28040, Spain - Author
Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, 28922, Spain - Author
Hosp Univ Infanta Leonor Virgen de la Torre, Dept Internal Med, Madrid 28031, Spain - Author
Intelligent Data Analysis Laboratory, Department of Electronic Engineering, ETSE (Engineering School), Universitat de València (UV), Valencia, 46100, Spain - Author
Univ Complutense Madrid, Sch Med, Dept Med, Madrid 28040, Spain - Author
Univ Rey Juan Carlos, Dept Phys Therapy Occupat Therapy Rehabil & Phys, Alcorcon 28922, Spain - Author
Univ Valencia UV, ETSE Engn Sch, Dept Elect Engn, Intelligent Data Anal Lab, Valencia 46100, Spain - Author
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Abstract

This study compared differences in the presence of post-COVID symptoms among vaccinated and non-vaccinated COVID-19 survivors requiring hospitalization due to the Delta (B.1.617.2) variant. This cohort study included hospitalized subjects who had survived SARS-CoV-2 infection (Delta variant) from July to August 2021 in an urban hospital in Madrid, Spain. Individuals were classified as vaccinated if they received full administration (i.e., two doses) of BNT162b2 (“Pfizer-BioNTech”) vaccines. Other vaccines were excluded. Those with just one dose of the BNT162b2 vaccine were considered as non-vaccinated. Patients were scheduled for a telephone interview at a follow-up around six months after infection for assessing the presence of post-COVID symptoms with particular attention to those symptoms starting after acute infection and hospitalization. Anxiety/depressive levels and sleep quality were likely assessed. Hospitalization and clinical data were collected from medical records. A total comprising 109 vaccinated and 92 non-vaccinated COVID-19 survivors was included. Vaccinated patients were older and presented a higher number of medical comorbidities, particular cardiorespiratory conditions, than non-vaccinated patients. No differences in COVID-19 onset symptoms at hospitalization and post-COVID symptoms six months after hospital discharge were found between vaccinated and non-vaccinated groups. No specific risk factor for any post-COVID symptom was identified in either group. This study observed that COVID-19 onset-associated symptoms and post-COVID symptoms six-months after hospitalization were similar between previously hospitalized COVID-19 survivors vaccinated and those non-vaccinated. Current data can be applied to the Delta variant and those vaccinated with BNT162b2 (Pfizer-BioNTech) vaccine. © 2022 by the authors.

Keywords

anxietydeltahadshospitalizationpost-covidsleepvaccineCovid-19DeltaDepression scaleHospitalizationPost-covidVaccine

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 WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2022, it was in position 24/136, thus managing to position itself as a Q1 (Primer Cuartil), in the category Medicine, Research & Experimental.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 1.22. This 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: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Weighted Average of Normalized Impact by the Scopus agency: 1.09 (source consulted: FECYT Feb 2024)
  • Field Citation Ratio (FCR) from Dimensions: 9.64 (source consulted: Dimensions Jul 2025)

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

  • WoS: 12
  • Scopus: 15
  • 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 2025-07-07:

  • 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: 65.
  • 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: 65 (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: 27.35.
  • The number of mentions on the social network X (formerly Twitter): 36 (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.

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Fernández de las Peñas, César) .

the author responsible for correspondence tasks has been Fernández de las Peñas, César.