RESUMEN
Background/Aims: The global pandemic of COVID-19 has caused tremendous loss of human life since 2019. Vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is one of the best policies to control the pandemic. The vaccination efficacy in Taiwanese patients with different comorbidities is elusive and to be explored. Method(s): Uninfected subjects who received 3-doses of mRNA vaccines (Moderna, BioNTech), non-replicating viral vector-based vaccines (AstraZeneca, AZ) or protein subunit vaccines (Medigen COVID-19 vaccine, MVC) were prospectively enrolled. SARSCoV2- IgG spike antibody level was determined (Abbott [SARS-CoV- 2 IgG II]) within 3 months after the last dose of vaccination. Charlson Comorbidity Index (CCI) was applied to disclose the association of vaccine titer and underlying comorbidities. Result(s): A total of 824 subjects were enrolled in the current study. The mean age was 58.9 years and males accounted for 48.7% of the population. The proportion of CCI with 0-1, 2-3 and>4 was 52.8% (n = 435), 31.3% (n = 258) and 15.9% (n = 131), respectively. The most commonly used vaccination combination was AZ-AZ-Moderna (39.2%), followed by Moderna-Moderna-Moderna (27.8%) and AZAZ- BioNTech (14.7%), respectively. The mean vaccination titer was 3.11 log BAU/mL after a median 48 days of the 3rd dose. Subjects of male gender, lower body mass index, chronic kidney disease, higher CCI, and receiving AZ-AZ based vaccination were likely to have a lower titer of antibody. There was a decreasing trend of antibody titer with the increase of CCT (trend P<0.001). Linear regression analysis revealed that AZ-AZ-based vaccination (beta: 0.341, 95% confidence intervals [CI]: 0.144, 0.21, P<0.001) and higher CCI (beta: - 0.055, CI: - 0.096, - 0.014, P = 0.009) independently correlated with low IgG spike antibody levels. Conclusion(s): Patients with more comorbidities had a poor response to 3 doses of COVID-19 vaccination. Further studies are warranted to clarify the efficacy of booster vaccination in the population. The vaccine titer did not differ between patient with or without chronic liver disease.
RESUMEN
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant has recently emerged and spread globally. An outbreak of coronavirus disease 2019 (COVID-19) caused by the Delta variant occurred in Southern Taiwan in June 2021 and has been eliminated [1]. However, in April 2022, there was an outbreak of the Omicron variant in Taiwan. Fifteen patients with Omicron variant were admitted to our hospital from April 26 to May 1, 2022. We compared the clinical characteristics of the patients with the Delta variant in June 2021 and the Omicron variant in April 2022 (Table 1). These laboratory data were the first laboratory data at admission, and no anti-COVID-19 therapy was prescribed before these data. There were no differences in age (59.9 vs. 57.1 years, P = 0.96), male gender (63.6 vs. 60.0%, P = 1.00), diabetes ratio (27.3 vs. 35.7%, P = 1.00), body mass index (25.0 vs. 26.0 kg/m2, P = 1.00), pneumonia ratio (18.2 vs. 40.0%, P = 0.40) between the Delta and Omicron variants. There were also no differences in serum levels of aspartate aminotransferase (AST) (40.1 vs. 25.8 IU/L, P = 0.24) and alanine aminotransferase (ALT) (26.3 vs. 27.2 IU/L, P = 0.64) between the two groups. All the patients with the Omicron variant were symptomatic. The most common symptoms were upper respiratory tract infections (60.0%) (Supplementary Table 1). Six patients developed pneumonia without mechanical ventilator support requirement during admission (40.0%). Remdesivir, Paxlovid, or Molnupiravir were prescribed to patients according to their clinical conditions. Among the patients with the Omicron variant, nine (60.0%) had past medical history of diabetes, four (26.7%) had hypertension, three had chronic kidney disease (20.0%), and three had malignancy history (20.0%). COVID-19 might cause liver injury and lead to a more unfavorable prognosis [2]. In this study, about one-fifth of the patients suffered from liver injury, which was similar to previous studies [3]. There was no difference in liver injury between the Delta and Omicron variants in our study, which echoes previous research [4]. COVID-19 vaccination might protect against symptomatic diseases caused by the Omicron variant [5]. Vaccination rates have increased since 2021. In the study, over ninety percent of the patients have received at least two doses of vaccination. In conclusion, we demonstrated no difference in liver injury ratio between the Delta and Omicron variants. To our knowledge, this is the first report that compares the Delta and Omicron variants in Taiwan.