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. 2022 Nov 7;18(6):1678-1682.
doi: 10.5114/aoms/155114. eCollection 2022.

A comparison of the protective effect of vaccination and clinical features between the SARS-CoV-2 wild-type strain and Delta (B.1.617.2) variant

Yanzi Li  1 , Zhi Wang  2 , Junhui Liu  3 , Jianfeng Han  4 , Lin Yang  4   5
Affiliations

A comparison of the protective effect of vaccination and clinical features between the SARS-CoV-2 wild-type strain and Delta (B.1.617.2) variant

Yanzi Li et al. Arch Med Sci. .

Abstract

Introduction: This study aimed to investigate the clinical features and vaccine effectiveness of patients with the SARS-CoV-2 wild-type strain and the Delta variant.

Methods: We retrospectively evaluated patients with the SARS-CoV-2 wild-type strain and the Delta variant.

Results: The Delta-variant group showed a higher infection rate in minors, who had higher incidence of anosmia or dysgeusia and shorter incubation period. Unvaccinated patients had a 15.59-fold higher risk of severe classification than vaccinated patients. The viral clearance time was significantly shorter in the Delta-variant group.

Conclusions: The Delta-variant group show higher transmissibility, and vaccination reduces the incidence of severe classification and promotes viral clearance.

Keywords: COVID-19; SARS-CoV-2; clinical feature; pandemic; transmission; vaccine.

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Conflict of interest statement

The authors declare no conflict of interest.

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References

    1. Moustafa AM, Planet PJ. Jumping a moving train: SARS-CoV-2 evolution in real time. J Pediatric Infect Dis Soc 2021; 10: S96-105. - PMC - PubMed
    1. Kadri SS, Simpson SQ. Potential implications of SARS-CoV-2 Delta variant surges for rural areas and hospitals. JAMA 2021; 326: 1003-4. - PubMed
    1. Rajabimajd N, Alimoradi Z, Griffiths MD. Impact of COVID-19-related fear and anxiety on job attributes: a systematic review. Asian J Soc Health Behav 2021; 4: 51-5.
    1. Liu FF, Zheng CJ, Wang LP, et al. . Interpretation of the protocol for prevention and control of COVID-19 in China (Edition 8). China CDC Wkly 2021; 3: 527-30. - PMC - PubMed
    1. Ryu BH, Hong SI, Lim SJ, et al. . Clinical features of adult COVID-19 patients without risk factors before and after the nationwide SARS-CoV-2 B.1.617.2 (Delta)-variant outbreak in Korea: experience from Gyeongsangnam-do. J Korean Med Sci 2021; 36: e341. - PMC - PubMed