Research ArticleOriginal Article
Open Access

Natural immunity to influenza A and B among Saudi blood donors in Al Madinah Al Munawarah, Saudi Arabia

Waleed H. Mahallawi, Nadir A. Ibrahim, Khalid S. Alahmadi, Abdullah K. Al-Harbi, Mohammed A. Almughthawi, Omar A. Alhazmi, Fayez H. Alsehli and Omar F. Khabour
Saudi Medical Journal December 2020, 41 (12) 1301-1307; DOI: https://doi.org/10.15537/smj.2020.12.05582

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Figures

  • Figure 1
    Figure 1

    Distribution of participants according to influenza A and influenza B antibodies. Influenza A and influenza B antibodies were measured using enzyme-linked immunosorbent assay (ELISA) of serum samples. Values less than 9 IU/µL were considered negative. Values between 9-11 IU/µL were considered equivocal. Values more than 11 IU/µL were considered positive.

  • Figure 2
    Figure 2

    Correlations between the levels of influenza A and influenza B antibodies. Values are expressed in IU/µL. A strong correlation was found between the level of influenza A antibody and the level of influenza B antibody (r2=0.503, p<0.001, N=360).

  • Figure 3
    Figure 3

    Correlations between the levels of influenza A and influenza B antibody and age. A) A significant correlation between influenza A antibody levels and age was found (r= -0.138, p<0.01). B) No correlation between influenza B antibody levels and age was found (r= -0.028, p>0.05).

  • Figure 4
    Figure 4

    Correlations between the levels of influenza A and influenza B antibody and BMI. A) No correlation between influenza A antibody levels and BMI was found (r= -0.055, p>0.05). B) No correlation between influenza B antibody levels and BMI was found (r=0.0186, p>0.05).

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