Fig. 3: Correlation of finger-prick and venous blood samples using the haemagglutination test on Wuhan and variants of concern. | Communications Medicine

Fig. 3: Correlation of finger-prick and venous blood samples using the haemagglutination test on Wuhan and variants of concern.

From: A rapid antibody screening haemagglutination test for predicting immunity to SARS-CoV-2 variants of concern

Fig. 3

Correlation of paired finger-prick and venous blood samples collected from vaccinated healthcare workers. HAT titres are shown by a symbol that can represent on or more blood samples. Correlations were analysed by linear regression shown in graphs and tables. a The point haemagglutination test (HAT) showing the correlation between finger-prick and venous whole blood samples (n = 78). Haemagglutination was scored as shown in the contingency table. “HAT+” samples with haemagglutination and “HAT−“ refers to no haemagglutination or endpoint titres <5. b–f Endpoint HAT titres of paired finger-prick and venous blood samples. Diluted finger-prick or venous whole blood samples (1 in 40 in phosphate buffered saline (PBS)) were centrifuged, and the supernatant was titrated in the HAT assay using IH4-RBD-reagents and autologous red blood cells (RBC) (washed and diluted 1 in 40 in PBS). b Wuhan-like (n = 63), c B1.1.7/Alpha (n = 62), d B.1.351/Beta (n = 62), e P1/Gamma, (n = 54), and f B.1.617.2/Delta (n = 53).

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