scholarly journals Development and Potential Application of Ras Domain Containing Protein from Haemonchus contortus for Diagnosis of Goat Infection

Animals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 138 ◽  
Author(s):  
Kalibixiati Aimulajiang ◽  
Man Cao ◽  
Shuyi Liao ◽  
Muhammad Ali-ul-Husnain Naqvi ◽  
Xiaowei Tian ◽  
...  

Haemonchus contortus is an important gastrointestinal nematode of small ruminants that causes significant mortality in goats worldwide. Diagnosis of this infection mainly depends on the evaluation of clinical signs and fecal examination. However, limitations often occur in early or mild infections. For this purpose, serological diagnosis seems to be more accurate and reliable. Ras domain-containing protein (Ras) is one of H. contortus’s excretory and secretory products (ESPs) that can be isolated from different larval stages of the nematode. In this study, the recombinant H. contortus Ras domain-containing protein (rHcRas) was expressed and purified and its diagnostic potential was evaluated. Reactions between rHcRas and goat sera were tested using Western blotting (WB). The results showed that rHcRas could be recognized by sera as early as 14 days post infection (DPI), and antibodies against rHcRas in infected goats could be maintained for over 89 days. No reaction was found between rHcRas and antibodies against Trichinella spiralis, Fasciola hepatica, or Toxoplasma gondii. An indirect enzyme-linked immunosorbent assay (ELISA) was produced based on rHcRas. The optimal coating antigen (157 ng of rHcRas/well) and serum dilutions (1:50) were determined via checkerboard titration. Indirect ELISA based on rHcRas showed 87.5% sensitivity and 90.6% specificity. The cut-off values for this experiment were determined to be 0.324 (positive) and 0.273 (negative), respectively, and the variation coefficient (CV) was less than 15%. The results of the indirect ELISA in-field examination showed that 17.6% (9/51) of the goats were infected with H. contortus, higher than the fecal examination results (15.7%, 8/51). When compared the results of the indirect ELISA and necropsy testing, 98.0% (50/51) consistency was found. These results indicated that rHcRas was a potential antigen for the diagnosis of H. contortus infection in goats.

Pathogens ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 34 ◽  
Author(s):  
Kalibixiati Aimulajiang ◽  
Muhammad Ali-ul-Husnain Naqvi ◽  
Wen Chu ◽  
Mingmin Lu ◽  
Xiaowei Tian ◽  
...  

Haemonchus contortus, a blood-sucking nematode of ruminants, causes large economic losses worldwide. Diagnosis of infection mainly depends on the evaluation of clinical signs and fecal examination. However, this has limitations for the diagnosis of early or light infections, where serological diagnosis seems to be more accurate and reliable. In this study, the recombinant H. contortus adhesion-regulating molecule protein (rHCADRM) was expressed and purified, and its diagnostic potential was evaluated. Serum samples from goats experimentally infected with H. contortus (n = 5) were collected at 0 (before infection, negative control), 7, 14, 21, 35, 49, 63, 85, and 103 days post-infection (DPI). The reactions between rHcADRM and goat serum were tested using Western blot (WB) analysis. The results show that rHcADRM can be recognized in the serum as early as 14 DPI, and the antibody against rHcADRM in infected goat could be maintained for over 89 days. No reaction was found between rHcADRM and antibodies against Trichinella spiralis, Fasciola hepatica, or Toxoplasma gondii. An indirect enzyme-linked immune sorbent assay (ELISA) was developed based on rHcADRM. The optimal coating antigen (279 ng of rHcADRM/well) and serum dilutions (1:50) were determined by checkerboard titration. A total of 64 serum samples, including 32 from H. contortus infection goats and 32 from helminth-free goats, were used to determine the positive (0.362) and negative (0.306) cut-off values for the ELISA. The results show this serological diagnosis method is highly sensitive (90.6%) and specific (93.75%). The coefficient of variation within run and between runs was less than 11%. To apply this indirect ELISA during field examination, 51 serum samples were randomly collected from goat farms and tested using this method. The result showed that 19.6% (10/51) of goats were infected with H. contortus, which was 100% consistent with the necropsy result, higher than that of fecal examination (15.7%, 8/51). These results indicate that rHcADRM could be a potential antigen for diagnosis of H. contortus infection in goats.


Animals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 548 ◽  
Author(s):  
Muhammad Ali-ul-Husnain Naqvi ◽  
Sana Zahra Naqvi ◽  
Muhammad Ali Memon ◽  
Kalibixiati Aimulajiang ◽  
Muhammad Haseeb ◽  
...  

Haemonchus contortus is recognized as one of the important health problems in small ruminants, leading to reduced production and economic loss for farmers worldwide. Prepatent diagnosis of H. contortus infection is crucial to improve control strategies as this helminth may remove up to one-fifth of total erythrocytes and may cause anemia, edema, diarrhea, and ultimately death in young animals. In this study, one of the excretory and secretory products, rHc-HCA59, was purified and used as antigen to detect specific antibodies in H. contortus infected goats during prepatent stage of infection using indirect enzyme linked immunosorbent assay (ELISA) as screening test. All goats (n = 38) were housed indoor, experimentally infected with 8000 infective larvae (L3) of H. contortus, and serum samples were collected prior to infection and at 14th day of infection. Immunoblotting was performed to confirm the results of indirect ELISA, evaluate the cross reactivity against rHc-HCA59 in sera of most common co-infecting parasites and rectify the false negative samples. Furthermore, three different batches of rHc-HCA59 were produced to evaluate the repeatability of ELISA. No eggs were detected in feces of all goats collected at 7th and 14th day of infection but, H. contortus eggs were detected at 21 days post infection in the feces. Indirect ELISA performed in this study showed 87% sensitivity and 100% specificity. The western blot analysis confirmed immunoreactivity in serum samples which scored positive in indirect ELISA and recognized the samples as negative which had OD450 lower than negative cut-off value in indirect ELISA. Furthermore, all false negative sera (n = 5) that had OD450 value between positive and negative cut-off value in rHc-HCA59 based ELISA were clearly positive in western blot. Moreover, no cross-reactivity was detected in ELISA and western blotting against rHc-HCA59 in positive sera of Toxoplasma gondii, Fasciola hepatica, and Trichinella spiralis. The results of this study concluded that combined use of indirect ELISA and western blotting with rHc-HCA59 is a potential immunodiagnostic tool for the detection of H. contortus infection during prepatent period in goats.


2020 ◽  
Author(s):  
Muhammad Ali-ul-Husnain Naqvi ◽  
KaLiBiXiaTi Aimulajiang ◽  
Muhammad Ali Memon ◽  
Muhammad Waqqas Hasan ◽  
Sana Zahra Naqvi ◽  
...  

Abstract Background : Haemonchus contortus ( H. contortus ) is one of the most important parasites that cause huge economic losses to small ruminant industry worldwide. Effective prognosis and treatment depend upon the early diagnosis of H. contortus infection. To date, no widely-approved methods for the identification of prepatent H. contortus infection are available to identify prepatent H. contortus infection. The aim of this study was to evaluate the diagnostic potential of recombinant cold shock H. contortus protein (rHc-CS) during early and late infections of H. contortus in goat. Results : Purified rHc-CS exhibited a clear band, with a molecular weight about 38 kDa. H. contortus eggs were not detected by fecal egg count technique from feces collected at 0 to 14 days post infection (D.P.I). However, eggs were detected at 21, 28 and 35 D.P.I. Hence, results of immunoblotting assay showed specific anti rHc-CS antibody detection in all goat sera collected at early stage (14 D.P.I) and late stage (21-103 D.P.I) of H. contortus infection. Furthermore, no cross reactivity was observed against Trichinella spiralis , Fasciola hepatica and Toxoplasma gondii or uninfected goats. Among several evaluated rHc-CS indirect-ELISA format variables, favorable antigen coating concentration was found 0.28μg/well at 37℃ 1h and overnight at 4°C. Moreover, optimum dilution ratio of serum and rabbit anti-goat IgG was recorded as 1:100 and 1:4000, respectively. The best blocking buffer was 5% Bovine Serum Albumin (BSA) while the best time for blocking, serum incubation and TMB reaction were recorded as 60, 120 and 10 min, respectively. The cut-off value for positive and negative interpretation was determined as 0.352 (OD 450 ). The diagnostic specificity and sensitivity of the rHc-CS, both were recorded as 100%. Conclusion : These results validated that rHc-CS is a potential immunodiagnostic antigen to detect the specific antibodies during early and late H. contortus infections in goat.


2019 ◽  
Author(s):  
Muhammad Ali-ul-Husnain Naqvi ◽  
KaLiBiXiaTi Aimulajiang ◽  
Muhammad Ali Memon ◽  
Muhammad Waqqas Hasan ◽  
Sana Zahra Naqvi ◽  
...  

Abstract Background: Haemonchus contortus (H. contortus) is the most abundant nematode causing haemonchosis with major economic losses to the small ruminant industry farming worldwide. Effective prognosis and treatment depend upon the early diagnosis of H. contortus infection. To date, no widely-approved methods are available to identify prepatent H. contortus infection. The aim of this study was to evaluate the diagnostic potential of recombinant cold shock H. contortus protein (rHc-CS) during early and late infections of H .contortus in goat. Results: Purified rHc-CS exhibited a clear band, with a molecular weight about 38 kDa. Fecal egg count technique was unable to detect H. contortus eggs in feces collected between 0 and 14 days post infection. Eggs were detected at 21, 28 and 35 days post infection. However, Specific anti rHc-CS antibodies were detectable in sera of all infected goats during early stage (2nd week of infection) and late stage (3rd to 14th week of infection) using immunoblotting assay. Furthermore, no cross reactivity was observed against most commonly found helminths (Trichinella spiralis, Fasciola hepatica, and Toxoplasma gondii) and uninfected goats. The format variables for rHc-CS indirect-ELISA were optimized. The optimum antigen coating concentration was found 0.28μg/well at 37℃ 1h and overnight at 4°C. Optimum dilution ratio of serum and rabbit anti-goat IgG was recorded 1:100 and 1:4000 respectively. The best blocking buffer was 5% bovine serum albumin (BSA) and the best time for blocking, serum incubation and TMB reaction was recorded as 60, 120 and 10 minutes respectively. The cut-off value for positive and negative interpretation was determined as 0.352 (OD450). The diagnostic specificity and sensitivity of the rHc-CS, both were recorded 100%. Conclusion: These results demonstrated that rHc-CS is a potential immunodiagnostic antigen to detect specific antibodies at early and late H. contortus infections in goat.


2019 ◽  
Author(s):  
Muhammad Ali-ul-Husnain Naqvi ◽  
KaLiBiXiaTi Aimulajiang ◽  
Muhammad Ali Memon ◽  
Muhammad Waqqas Hasan ◽  
Sana Zahra Naqvi ◽  
...  

Abstract Background: Haemonchus contortus (H. contortus) is the most abundant nematode causing haemonchosis with major economic losses to the small ruminant industry farming worldwide. Effective prognosis and treatment depend upon the early diagnosis of H. contortus infection. To date, no widely-approved methods are available to identify prepatent H. contortus infection. The aim of this study was to evaluate the diagnostic potential of recombinant cold shock H. contortus protein (rHc-CS) during early and late infections of H .contortus in goat. Results: Purified rHc-CS exhibited a clear band, with a molecular weight about 38 kDa. No eggs of H. contortus were detected in feces collected at 14 days post infection. However, Specific anti rHc-CS antibodies were detectable in sera of all infected goats during early stage (2nd week of infection) and late stage (3rd to 14th week of infection) using immunoblotting assay. Furthermore, no cross reactivity was observed against most commonly found pathogens (Trichinella spiralis, Fasciola hepatica, and Toxoplasma gondii) and uninfected goats. The format variables for rHc-CS indirect-ELISA were optimized. The optimum antigen coating concentration was found 0.28μg/well at 37℃ 1h and overnight at 4°C. Optimum dilution ratio of serum and rabbit anti-goat IgG was recorded 1:100 and 1:4000 respectively. The best blocking buffer was 5% bovine serum albumin (BSA) and the best time for blocking, serum incubation and TMB reaction was recorded as 60, 120 and 10 minutes respectively. The cut-off value for positive and negative interpretation was determined as 0.352 (OD450). The diagnostic specificity and sensitivity of the rHc-CS, both were recorded 100%. Conclusion: These results demonstrated that rHc-CS is a potential immunodiagnostic antigen to detect specific antibodies at early and late H. contortus infections in goat.


2019 ◽  
Author(s):  
Muhammad Ali-ul-Husnain Naqvi ◽  
KaLiBiXiaTi Aimulajiang ◽  
Muhammad Ali Memon ◽  
Muhammad Waqqas Hasan ◽  
Sana Zahra Naqvi ◽  
...  

Abstract Background: Haemonchus contortus (H. contortus) is one of the most important parasites that cause huge economic losses to small ruminant industry worldwide. Effective prognosis and treatment depend upon the early diagnosis of H. contortus infection. To date, no widely-approved methods for the identification of prepatent H. contortus infection are available to identify prepatent H. contortus infection. The aim of this study was to evaluate the diagnostic potential of recombinant cold shock H. contortus protein (rHc-CS) during early and late infections of H. contortus in goat. Results: Purified rHc-CS exhibited a clear band, with a molecular weight about 38 kDa. H. contortus eggs were not detected by fecal egg count technique from feces collected at 0 to 14 days post infection (D.P.I). However, eggs were detected at 21, 28 and 35 D.P.I. Hence, results of immunoblotting assay showed specific anti rHc-CS antibody detection in all goat sera collected at early stage (14 D.P.I) and late stage (21-103 D.P.I) of H. contortus infection. Furthermore, no cross reactivity was observed against Trichinella spiralis, Fasciola hepatica and Toxoplasma gondii or uninfected goats. Among several evaluated rHc-CS indirect-ELISA format variables, favorable antigen coating concentration was found 0.28μg/well at 37℃ 1h and overnight at 4°C. Moreover, optimum dilution ratio of serum and rabbit anti-goat IgG was recorded as 1:100 and 1:4000, respectively. The best blocking buffer was 5% Bovine Serum Albumin (BSA) while the best time for blocking, serum incubation and TMB reaction were recorded as 60, 120 and 10 min, respectively. The cut-off value for positive and negative interpretation was determined as 0.352 (OD450). The diagnostic specificity and sensitivity of the rHc-CS, both were recorded as 100%. Conclusion: These results validated that rHc-CS is a potential immunodiagnostic antigen to detect the specific antibodies during early and late H. contortus infections in goat.


2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Annapurna S. Agasthya ◽  
Srikrishna Isloor ◽  
Prabhudas Krishnamsetty

Brucellosis is one of the most important reemerging zoonoses in many countries. Brucellosis is caused by Gram-negative coccobacillus belonging to genusBrucella. Human brucellosis often makes the diagnosis difficult. The symptoms and clinical signs most commonly reported are fever, fatigue, malaise, chills, sweats headaches, myalgia, arthralgia, and weight loss. Some cases have been presented with only joint pain, lower backache, and involuntary limb movement, burning feet, or ischemic heart attacks. The focus of this work was to develop a highly sensitive and specific indirect ELISA by using smooth lipopolysaccharide antigen ofBrucella abortus 99to detect anti-Brucellaantibodies at Project Directorate on Animal Disease Monitoring and Surveillance. Serum samples collected from 652 individuals in whom fever was not the major symptom but the complaint was of joint pain, headache, lower backache, and so forth, were screened by Rose Bengal plate agglutination test (RBPT) and standard tube agglutination test (STAT). Subsequent testing of sera by indigenous indirect ELISA detected 20 samples positive (3.6% seroprevalence), and indirect ELISA was found to be more sensitive than RBPT and STAT. The seroprevalence in South Karnataka was 2.14%, and in North Karnataka it was 0.92%.


Parasitology ◽  
2016 ◽  
Vol 143 (14) ◽  
pp. 1990-1999 ◽  
Author(s):  
QINGLI NIU ◽  
ZHIJIE LIU ◽  
JIFEI YANG ◽  
PEIFA YU ◽  
YUPING PAN ◽  
...  

SUMMARYOvine babesiosis is one of the most important tick-borne haemoparasitic diseases of small ruminants. The ovine parasite Babesia sp. Xinjiang is widespread in China. In this study, recombinant full-length XJrRAP-1aα2 (rhoptry-associated protein 1aα2) and C-terminal XJrRAP-1aα2 CT of Babesia sp. Xinjiang were expressed and used to evaluate their diagnostic potential for Babesia sp. Xinjiang infections by indirect enzyme-linked immunosorbent assay (ELISA). Purified XJrRAP-1aα2 was tested for reactivity with sera from animals experimentally infected with Babesia sp. Xinjiang and other haemoparasites using Western blotting and ELISA. The results showed no cross-reactivities between XJrRAP-1aα2 CT and sera from animals infected by other pathogens. High level of antibodies against RAP-1a usually lasted 10 weeks post-infection (wpi). A total of 3690 serum samples from small ruminants in 23 provinces located in 59 different regions of China were tested by ELISA. The results indicated that the average positive rate was 30·43%, and the infections were found in all of the investigated provinces. This is the first report on the expression and potential use of a recombinant XJrRAP-1aα2 CT antigen for the development of serological assays for the diagnosis of ovine babesiosis, caused by Babesia sp. Xinjiang.


2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Harisankar Singha ◽  
Praveen Malik ◽  
Sachin K. Goyal ◽  
Sandip K. Khurana ◽  
Chiranjay Mukhopadhyay ◽  
...  

Objective. To express truncated TssB protein ofBurkholderia malleiand to evaluate its diagnostic efficacy for serological detection of glanders among equines.Materials and Methods. In an attempt to develop recombinant protein based enzyme-linked immunosorbent assay (ELISA), N-terminal 200 amino acid sequences ofB. malleiTssB protein—a type 6 secretory effector protein—were expressed in prokaryotic expression system. Diagnostic potential of recombinant TssB protein was evaluated in indirect ELISA using a panel of glanders positive (n=49), negative (n=30), and field serum samples (n=1811). Cross-reactivity of the assay was assessed with equine disease control serum and human melioidosis positive serum.Results. In comparison to CFT, diagnostic sensitivity and specificity of ELISA were 99.7% and 100%, respectively.Conclusions. The indirect ELISA method using the truncated TssB offered safer and more rapid and efficient means of serodiagnosis of glanders in equines. These data highlight the use of TssB as potential diagnostic antigen for serological diagnosis of glanders.


2015 ◽  
Vol 6 (2) ◽  
pp. 87-92 ◽  
Author(s):  
A. A. Boyko

Wormsof classes Nematoda Rudolphi, 1808, Trematoda Rudolphi, 1808 and Cestoda Rudolphi, 1808 were registered in small ruminants (sheep and goats) in Dnipropetrovsk region. Identified nematodes belongto Strongylata Railliet et Henry, 1913, Rhabditata Chitwood, 1933 and Trichurata Skrjabin, 1915. Among the trematodes, representatives of Fasciolata (Skrjabin et Schulz, 1935) were identified. Cestodes were represented by Anoplocephalata (Skrjabin, 1933). Among the specific types of nematodes,representatives of the Strongylata suborder were found: Muellerius sp., Protostrongylus sp., Haemonchus contortus Rundolphi, 1802, Nematodirus sp. Among the helminths Rhabditata we identified Strongyloides papillosus Wedl, 1856, Trichurata –Trichuris sp., Fasciolata –Fasciola hepatica Linnaeus, 1758 andDicrocelium lanceatum Stiles et Hassall, 1896, Anoplocephalata –Moniezia expansa (Rudolphi, 1810) andM. benedeni (Moniez, 1879). The dominant species among worms in ungulates was defined as nematode H. contortus. The smallest share in the group was taken by trematode species F. hepatica and nematodesTrichuris sp. The highest biodiversity indices are recorded in samples of material selected from ungulates consuming pasture herbage from May to September (ten species of worms belonging to three classes:Muellerius sp., Protostrongylus sp., H. contortus, Nematodirus sp., S. papillosus, Trichuris sp., F. hepatica, D. lanceatum, M. expansa, M. benedeni were registered). In animals not pastured throughout the year three types of worms of the class Nematoda: S. papillosus, H. contortus and Nematodirus sp. were defined.


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