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. 2016 Jun 6;23(6):507–514. doi: 10.1128/CVI.00724-15

TABLE 1.

Assay optimization to establish the serum dilution without nonspecific binding to anti-goat IgG and anti-sheep IgM conjugates when 12 known negative goat sera were tested for antibodies against phase 1 and 2 C. burnetii antigen using the indirect immunofluorescence assaya

Sample ID or parameter IFA result at indicated sample dilution or no. of samples
Phase 2 antigens
Phase 1 antigens
5 10 20 40 80 160 5 10 20 40 80 160
Anti-goat IgG conjugate
    370 ±
    371 ± ±
    372 ± ± ±
    373 ± ± ±
    374 ± ±
    375
    924 ± ± ±
    925
    927 ± ± ± ± ±
    928
    930 ± ±
    936 ± ± ± ± ±
    No. of samples with ± result 9 8 5 2 2 0 0 0 0 0 0 0
Anti-sheep IgM conjugate
    370 ± ± ± ±
    371 ± ± ± ± ± ± ± ±
    372 ± ± ± ±
    373 ± ± ±
    374 ± ± ± ± ± ±
    375 ± ± ± ± ± ± ± ±
    924 ± ± ±
    925 ± ± ± ±
    927 ± ± ± ± ± ±
    928 ± ± ± ± ± ± ± ±
    930 ± ± ±
    936 ± ± ± ± ± ± ± ±
    No. of samples with ± result 11 11 10 4 0 0 8 7 6 6 3 0
a

−, negative; ±, nonspecific binding; ID, identification; IFA, indirect immunofluorescence assay.