Evaluation of falcivax against quantitative buffy coat (QBC) for the diagnosis of malaria

Bimala Gurung, Indira Bairy, Jagadishchandra, Chetan Manohar

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Introduction: Microscopic detection of appropriately stained blood smear for the diagnosis of Malaria has been the standard diagnostic technique for identifying malaria infections for more than a century. The technique is capable of accurate and reliable identification when performed by skilled microscopists using defined protocols. The problems associated with implementing and sustaining a level of skilled microscopy appropriate for clinical diagnosis have particularly prompted the development of malaria rapid diagnostic devices (MRDDs). The current MRDDs are based on antigen capture immunoassay methodologies using immunochromatographic strip (ICS) technology. The newer generations of MRDDs are using more antigens like Merozoite protein 2 and circumsporozoite proteins. Further these antigens are obtained using recombinant techniques. This study was done for the evaluation of two commercially available immunossays against QBC for the diagnosis of Malaria. Aim of the study: The aim of the study is to evaluate Falcivax (Immunochromatographic Strip) test for the diagnosis of Malaria and to compare with Quantitative Buffy Coat (QBC). Materials & methods: A total of 100 patients attending outpatient department of Kasturba Hospital, Manipal, India, with their own initiative and meeting the inclusion criteria are included in the study. 2ml of blood was collected by venipuncture into tubes (Vacutainer blood collection system) containing EDTA as anticoagulant from all patients. Tests were run in batches of 8 samples at a time for Falcivax, Smear status by QBC, clinical features and relevant laboratory data of each sample was noted down. Results: Out of 100 patients 70 tested positive for malaria by QBC with P. falciparum accounting for 32(45.7%) and P. vivax 37(52.9%). In comparison with the study control - QBC in the detection of malaria, Falcivax test showed sensitivtiy, specificity, positive predictive value and negative predictive value of 90.0%, 100.0%, 100.0% and 81.0% respectively. Conclusion: Falcivax showed a reduced sensitivity compared to the QBC. Hence QBC still continues to be better option than MRDDs for detection of plasmodium infection in health care facilities with all expertise.

Original languageEnglish
Pages (from-to)132-140
Number of pages9
JournalInternational Journal of Collaborative Research on Internal Medicine and Public Health
Volume2
Issue number5
Publication statusPublished - 01-05-2010

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Malaria
Equipment and Supplies
Antigens
Merozoites
Phlebotomy
Health Facilities
Hospital Departments
Immunoassay
Edetic Acid
Anticoagulants
India
Microscopy
Proteins
Outpatients
Technology
Delivery of Health Care
Infection

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Public Health, Environmental and Occupational Health

Cite this

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title = "Evaluation of falcivax against quantitative buffy coat (QBC) for the diagnosis of malaria",
abstract = "Introduction: Microscopic detection of appropriately stained blood smear for the diagnosis of Malaria has been the standard diagnostic technique for identifying malaria infections for more than a century. The technique is capable of accurate and reliable identification when performed by skilled microscopists using defined protocols. The problems associated with implementing and sustaining a level of skilled microscopy appropriate for clinical diagnosis have particularly prompted the development of malaria rapid diagnostic devices (MRDDs). The current MRDDs are based on antigen capture immunoassay methodologies using immunochromatographic strip (ICS) technology. The newer generations of MRDDs are using more antigens like Merozoite protein 2 and circumsporozoite proteins. Further these antigens are obtained using recombinant techniques. This study was done for the evaluation of two commercially available immunossays against QBC for the diagnosis of Malaria. Aim of the study: The aim of the study is to evaluate Falcivax (Immunochromatographic Strip) test for the diagnosis of Malaria and to compare with Quantitative Buffy Coat (QBC). Materials & methods: A total of 100 patients attending outpatient department of Kasturba Hospital, Manipal, India, with their own initiative and meeting the inclusion criteria are included in the study. 2ml of blood was collected by venipuncture into tubes (Vacutainer blood collection system) containing EDTA as anticoagulant from all patients. Tests were run in batches of 8 samples at a time for Falcivax, Smear status by QBC, clinical features and relevant laboratory data of each sample was noted down. Results: Out of 100 patients 70 tested positive for malaria by QBC with P. falciparum accounting for 32(45.7{\%}) and P. vivax 37(52.9{\%}). In comparison with the study control - QBC in the detection of malaria, Falcivax test showed sensitivtiy, specificity, positive predictive value and negative predictive value of 90.0{\%}, 100.0{\%}, 100.0{\%} and 81.0{\%} respectively. Conclusion: Falcivax showed a reduced sensitivity compared to the QBC. Hence QBC still continues to be better option than MRDDs for detection of plasmodium infection in health care facilities with all expertise.",
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Evaluation of falcivax against quantitative buffy coat (QBC) for the diagnosis of malaria. / Gurung, Bimala; Bairy, Indira; Jagadishchandra; Manohar, Chetan.

In: International Journal of Collaborative Research on Internal Medicine and Public Health, Vol. 2, No. 5, 01.05.2010, p. 132-140.

Research output: Contribution to journalArticle

TY - JOUR

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N2 - Introduction: Microscopic detection of appropriately stained blood smear for the diagnosis of Malaria has been the standard diagnostic technique for identifying malaria infections for more than a century. The technique is capable of accurate and reliable identification when performed by skilled microscopists using defined protocols. The problems associated with implementing and sustaining a level of skilled microscopy appropriate for clinical diagnosis have particularly prompted the development of malaria rapid diagnostic devices (MRDDs). The current MRDDs are based on antigen capture immunoassay methodologies using immunochromatographic strip (ICS) technology. The newer generations of MRDDs are using more antigens like Merozoite protein 2 and circumsporozoite proteins. Further these antigens are obtained using recombinant techniques. This study was done for the evaluation of two commercially available immunossays against QBC for the diagnosis of Malaria. Aim of the study: The aim of the study is to evaluate Falcivax (Immunochromatographic Strip) test for the diagnosis of Malaria and to compare with Quantitative Buffy Coat (QBC). Materials & methods: A total of 100 patients attending outpatient department of Kasturba Hospital, Manipal, India, with their own initiative and meeting the inclusion criteria are included in the study. 2ml of blood was collected by venipuncture into tubes (Vacutainer blood collection system) containing EDTA as anticoagulant from all patients. Tests were run in batches of 8 samples at a time for Falcivax, Smear status by QBC, clinical features and relevant laboratory data of each sample was noted down. Results: Out of 100 patients 70 tested positive for malaria by QBC with P. falciparum accounting for 32(45.7%) and P. vivax 37(52.9%). In comparison with the study control - QBC in the detection of malaria, Falcivax test showed sensitivtiy, specificity, positive predictive value and negative predictive value of 90.0%, 100.0%, 100.0% and 81.0% respectively. Conclusion: Falcivax showed a reduced sensitivity compared to the QBC. Hence QBC still continues to be better option than MRDDs for detection of plasmodium infection in health care facilities with all expertise.

AB - Introduction: Microscopic detection of appropriately stained blood smear for the diagnosis of Malaria has been the standard diagnostic technique for identifying malaria infections for more than a century. The technique is capable of accurate and reliable identification when performed by skilled microscopists using defined protocols. The problems associated with implementing and sustaining a level of skilled microscopy appropriate for clinical diagnosis have particularly prompted the development of malaria rapid diagnostic devices (MRDDs). The current MRDDs are based on antigen capture immunoassay methodologies using immunochromatographic strip (ICS) technology. The newer generations of MRDDs are using more antigens like Merozoite protein 2 and circumsporozoite proteins. Further these antigens are obtained using recombinant techniques. This study was done for the evaluation of two commercially available immunossays against QBC for the diagnosis of Malaria. Aim of the study: The aim of the study is to evaluate Falcivax (Immunochromatographic Strip) test for the diagnosis of Malaria and to compare with Quantitative Buffy Coat (QBC). Materials & methods: A total of 100 patients attending outpatient department of Kasturba Hospital, Manipal, India, with their own initiative and meeting the inclusion criteria are included in the study. 2ml of blood was collected by venipuncture into tubes (Vacutainer blood collection system) containing EDTA as anticoagulant from all patients. Tests were run in batches of 8 samples at a time for Falcivax, Smear status by QBC, clinical features and relevant laboratory data of each sample was noted down. Results: Out of 100 patients 70 tested positive for malaria by QBC with P. falciparum accounting for 32(45.7%) and P. vivax 37(52.9%). In comparison with the study control - QBC in the detection of malaria, Falcivax test showed sensitivtiy, specificity, positive predictive value and negative predictive value of 90.0%, 100.0%, 100.0% and 81.0% respectively. Conclusion: Falcivax showed a reduced sensitivity compared to the QBC. Hence QBC still continues to be better option than MRDDs for detection of plasmodium infection in health care facilities with all expertise.

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