Observer 2    
    + -    
Observer 1 + 3 23 26 59.09%
- 3 15 18 40.91%
    6 38 44  
    Actual agreement= 40.91%  
    Chance agreement= 43.39%  
    Kappa statistic= -0.04  
Table 3: Agreement between positive PCR IgA and IgG antibody.
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