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Durability of ChAdOx1 nCoV-19 (Covishield ®) Vaccine Induced Antibody Response in Health Care Workers.
- Source :
- Vaccines; Jan2023, Vol. 11 Issue 1, p84, 11p
- Publication Year :
- 2023
-
Abstract
- (i) Background: ChAdOx1 nCoV-19 (Covishield<superscript>®</superscript>) vaccine is widely used in India. We studied the Covishield<superscript>®</superscript> induced antibody response and its durability among health care workers (HCWs) (ii) Method: HCWs received two doses (0.5 mL) four weeks apart. Blood specimens, collected before each dose, day (D) 60, D150 and D270 after second dose, were tested for anti-spike antibody (ASAb) titre and neutralising antibody (%) (NAb) using Elecsys Anti-SARS-CoV-2 S (Roche) and SARS-CoV-2 NAb ELISA Kit (Invitrogen), respectively. Data are expressed as proportions and median (interquartile range) and compared using non-parametric (iii) Result: Among 135 HCWs (83 males; age 45 (37–53); 36 had pre-existing ASAb), 29 (21.5%) acquired COVID-19 after 60 (39–68) days of vaccination. ASAb titre before second dose and at D60, D150, D270 were 77.2 (19.4–329.4), 512 (114.5–9212), 149 (51.6–2283) and 2079 (433.9–8644) U/mL, respectively. Compared to those without pre-existing ASAb, titres were significantly higher before second dose (5929 vs. 41, p < 0.001), D60 (3395 vs. 234, p = 0.007) and D150 (1805 vs. 103, p < 0.001) in participants with pre-existing ASAb; NAb were also higher (80 vs. 18, p < 0.001) before second dose. Between those who acquired infection or not after vaccination, ASAb titres were comparable before second dose (77 vs. 78, p = 0.362) but significantly higher at D60 (14,019 vs. 317, p < 0.001) and D150 (2062 vs. 121, p = 0.002) in the former group, though NAb percentage were higher at D60 (87 vs. 27, p < 0.001) and D150 (79 vs. 25, p = 0.007) only (iv) Conclusions: Covishield<superscript>®</superscript> induces a higher antibody titre in those with pre-existing ASAb. The vaccine induced antibody starts falling 5 months after vaccination. [ABSTRACT FROM AUTHOR]
- Subjects :
- MEDICAL personnel
ANTIBODY formation
COVID-19 vaccines
ANTIBODY titer
VACCINES
Subjects
Details
- Language :
- English
- ISSN :
- 2076393X
- Volume :
- 11
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Vaccines
- Publication Type :
- Academic Journal
- Accession number :
- 161561443
- Full Text :
- https://doi.org/10.3390/vaccines11010084