Evaluation of the Fluorescence Polarization Assay as a Rapid On-Spot Test for Ruminant Brucellosis in Côte d'Ivoire

Abstract

Brucellosis is a zoonosis of economic and public health concern. While most diagnostic tests for brucellosis can only be performed in the laboratory, the Fluorescence Polarization Assay (FPA) was developed as a rapid point-of-care field test. This pilot project aimed to validate the use of FPA for rapid diagnosis of ruminant brucellosis on the field, and to compare the FPA performance with that of the more commonly used Rose Bengal Test (RBT). Blood samples were first collected from ruminants in a livestock market, and later from a nearby slaughterhouse in Port Bouët, Abidjan, Côte d'Ivoire. Samples collected in the livestock market were processed and tested with the FPA in a central laboratory, while samples collected in the slaughterhouse were processed immediately and the FPA was performed on site. To assess the FPA intra-test agreement, a portion of the serum samples tested at the slaughterhouse were re-tested with the FPA in the laboratory later the same day. To assess inter-test agreement, all serum samples were retested with the RBT. A total of 232 samples were tested with the FPA, 106 and 126 from the livestock market and slaughterhouse, respectively. Of these, 26 tested positive and 39 were doubtful for brucellosis. The FPA was repeated on 28 of the samples collected at the slaughterhouse, and comparison of results indicated a moderate intra-test agreement (Kappa = 0.41). The agreement improved when the doubtful category was treated as negative (Kappa = 0.65), and when cattle were excluded (Kappa = 0.56 to 0.61). The RBT was performed on 229 samples, and of these 10 tested positive. A comparison of FPA and RBT results indicated poor agreement (Kappa = 0.00); this improved to slight when only samples taken at the livestock market and tested in the laboratory were considered (Kappa = 0.14). The FPA did not perform well in tropical field conditions, possibly due to the high ambient temperatures in the slaughterhouse. Moreover, a difference in performance was noted in relation to the species tested, whereby the FPA seemed to perform better on sheep and goat samples, compared to cattle samples. These findings highlight that further adjustments are needed before implementing the FPA on the field.

Risk factors of tuberculosis in human and its association with cattle TB in Nepal: A one health approach

“…While, there is only a slight kappa agreement between the rapid test and ELISA (κ = 0.18, 95%CI: 0.06–0.31, p = 0.003). However, there is a substantial agreement between the tuberculin tests and ELISA test (κ = 0.72, 95% CI: 0.48–0.95, p < 0.01), which indicates substantial agreement between these two tests [ 36 , 38 ].…”

“…For the cattle data, the study was performed with variables related to animal characteristics and their relations to estimated prevalence against the parallel testing of tuberculin, rapid test, and ELISA. The inter-test agreements among the tuberculin, rapid diagnostic test, and indirect ELISA were calculated by Kappa statistic [ 36 , 38 ].…”

Sero-epidemiology and associated risk factors of brucellosis among sheep and goat population in the south western Nepal: a comparative study

“…Any herd with at least an animal tested seropositive to either RBT or I-ELISA was deemed positive flock. The chi-square test of associations and inter-test agreement between the Rose Bengal Test and ELISA tests for the seropositivity of brucellosis for sheep and goat were calculated [ 34 , 35 ].…”

Sero-epidemiology and associated risk factors of brucellosis among sheep and goat population in the south western Nepal: A comparative study

“…Individual level disease prevalence of sheep and goat and their ock level prevalence were calculated to estimate the overall species-wise disease prevalence in the district. The chi-square test of correlations and inter-test agreement between the Rose Bengal Test and ELISA tests for the seropositivity of brucellosis for sheep and goat were calculated [34][35].…”

“…There was a signi cant association (χ 2 = 28.29, p<0.001) between seropositivity of RBT and ELISA tests for brucellosis in sheep and goats [46] and an extremely high level of agreement (κ = 0.95, 95% CI: 0.85-1, p<0.001 [35].…”