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A novel colloidal gold immunochromatography assay strip for the diagnosis of schistosomiasis japonica in domestic animals

View Article: PubMed Central - PubMed

ABSTRACT

Background: Schistosomiasis remains a major public health concern in China and an epidemiological survey has revealed that schistosome-infected bovines and goats are the main transmission sources for the disease. Therefore, development of a sensitive technique for the diagnosis of schistosomiasis in domestic animals is necessary.

Method: A novel colloidal gold immunochromatography assay (GICA) strip was developed for detecting Schistosoma japonicum in domestic animals. The colloidal gold was conjugated with recombinant streptococcal protein G (rSPG). As the test and control lines, the schistosome soluble egg antigen and rSPG, respectively, were blotted on nitrocellulose membrane.

Results: The lowest detectable serum dilution was 1∶640 for schistosome-infected buffaloes. The cross-reaction rate of GICA was 14.29% with Paramphistomum sp. in buffaloes, 16.67% with Haemonchus sp. in goats, and 33.33% with Orientobilharzia sp. in goats. These results were slightly lower and similar to those obtained through ELISA. Moreover, the strips for detecting S. japonicum in mice, rabbits, buffaloes, and goats showed high sensitivity (100.00%, 100.00%, 100.00%, and 100.00%, respectively) and specificity (100.00%, 100.00%, 94.23%, and 88.64%, respectively). And the sensitivity or specificity of the GICA strips did not present any significant differences after storage for 12 months at room temperature. When compared with ELISA, the GICA strips exhibited similar sensitivity and specificity in the diagnosis of schistosomiasis in mice, rabbits, buffaloes, and goats. Besides, only 5 μl of serum are required for the test and the detection can be completed within 5 min.

Conclusion: This study is the first to develop a GICA strip using gold–rSPG conjugate for the diagnosing of schistosomiasis in domestic animals, and preliminary results showed that the developed strip may be suitable for large-scale screening of schistosomiasis in endemic areas.

Electronic supplementary material: The online version of this article (doi:10.1186/s40249-017-0297-z) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus

SPG transformation process
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Fig1: SPG transformation process

Mentions: The C domain of protein G was determined from the GenBank sequences of SPG, and the rare codons of the sequences were replaced with E. coli-preferred codons. Subsequently, the C1, C2, C3, and D domains were found, and the C1 and C2 domains were replaced with the C3 domain (Fig. 1). The rSPG was obtained from our previous study [10].Fig. 1


A novel colloidal gold immunochromatography assay strip for the diagnosis of schistosomiasis japonica in domestic animals
SPG transformation process
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC5384140&req=5

Fig1: SPG transformation process
Mentions: The C domain of protein G was determined from the GenBank sequences of SPG, and the rare codons of the sequences were replaced with E. coli-preferred codons. Subsequently, the C1, C2, C3, and D domains were found, and the C1 and C2 domains were replaced with the C3 domain (Fig. 1). The rSPG was obtained from our previous study [10].Fig. 1

View Article: PubMed Central - PubMed

ABSTRACT

Background: Schistosomiasis remains a major public health concern in China and an epidemiological survey has revealed that schistosome-infected bovines and goats are the main transmission sources for the disease. Therefore, development of a sensitive technique for the diagnosis of schistosomiasis in domestic animals is necessary.

Method: A novel colloidal gold immunochromatography assay (GICA) strip was developed for detecting Schistosoma japonicum in domestic animals. The colloidal gold was conjugated with recombinant streptococcal protein G (rSPG). As the test and control lines, the schistosome soluble egg antigen and rSPG, respectively, were blotted on nitrocellulose membrane.

Results: The lowest detectable serum dilution was 1∶640 for schistosome-infected buffaloes. The cross-reaction rate of GICA was 14.29% with Paramphistomum sp. in buffaloes, 16.67% with Haemonchus sp. in goats, and 33.33% with Orientobilharzia sp. in goats. These results were slightly lower and similar to those obtained through ELISA. Moreover, the strips for detecting S. japonicum in mice, rabbits, buffaloes, and goats showed high sensitivity (100.00%, 100.00%, 100.00%, and 100.00%, respectively) and specificity (100.00%, 100.00%, 94.23%, and 88.64%, respectively). And the sensitivity or specificity of the GICA strips did not present any significant differences after storage for 12 months at room temperature. When compared with ELISA, the GICA strips exhibited similar sensitivity and specificity in the diagnosis of schistosomiasis in mice, rabbits, buffaloes, and goats. Besides, only 5 μl of serum are required for the test and the detection can be completed within 5 min.

Conclusion: This study is the first to develop a GICA strip using gold–rSPG conjugate for the diagnosing of schistosomiasis in domestic animals, and preliminary results showed that the developed strip may be suitable for large-scale screening of schistosomiasis in endemic areas.

Electronic supplementary material: The online version of this article (doi:10.1186/s40249-017-0297-z) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus