EBV VCA IgA ELISA Kit (Epstein–Barr Virus Viral-Capsid Antigen)

Full Name: EBV VCA IgA ELISA Kit (Epstein–Barr Virus Viral-Capsid Antigen)
Reactivity: Human
Sample Type: Plasma, Serum
Sensitivity: 1.0 U/ml

BACKGROUND

Epstein–Barr virus viral-capsid antigen (EBV VCA) has an important role in providing the viral capsid of the Epstein–Barr virus (EBV). This antigen is targeted by anti-VCA antibodies and these antibodies are crucial in the diagnosis of infectious mononucleosis using many different serology testing methods. Elevated levels of anti-VCA IgG antibodies is a good indicator of prior infection whereas elevated levels of anti-VCA IgM can indicate acute infection.

The anti-VCA IgM appears early during an EBV infection and it tends to disappear between 4-6 weeks, whereas anti-VCA IgG is present during the acute phase of EBV infections (peaks between 2-4 weeks and persist throughout a person life). Clinical findings of infectious mononucleosis can be identified in conjunction with the appearance of IgM and IgG anti-VCA antibodies. Also, for primary infections, the sensitivity of IgM and IgG anti-VCA testing are regarded as being 100% reliable.

INTENDED USE

Human EBV VCA IgA ELISA kit is intended for detecting in-vitro amounts of human IgA antibodies to Epstein–Barr virus viral-capsid antigen (EBV VCA IgA) using serum and plasma. This assay has a minimum analytical sensitivity limit of 1.0 U/ml.

CONTENT

All reagents supplied need to be stored at 2 °C – 8 °C, unopened reagents will retain reactivity until expiration date. Do not use reagents beyond this date.

• EBV VCA coated microtiter strips.
• Calibrator A (Negative Control).
• Calibrator D (Positive Control).
• Calibrator B (Cut-Off Standard).
• Calibrator C (Weak Positive Control).
• Sample Diluent.
• Enzyme Conjugate.
• TMB Substrate.
• Washing Buffer (10x).
• Stop Solution.

SENSITIVITY

The minimum detection sensitivity level of human IgA antibodies against Epstein–Barr virus viral-capsid antigen (EBV VCA IgA) using current EBV VCA IgA ELISA kit was 1.0 U/ml. The dynamic range for this assay is 1.0 – 125.0 U/ml.

ASSAY CHARACTERISTICS

– Intra-Assay-Precision: 5.8 %
– Inter-Assay-Precision: 3.4 – 5.0 %
– Inter-Lot-Precision 3.9 – 8.7 %
– Analytical Sensitivity: 1.01 U/mL
– Recovery: 100 – 104 %
– Linearity: 84 – 116 %
– Cross-Reactivity: No cross-reactivity to Measles, Mumps and Varicella.
– Interferences: No interferences to bilirubin up to 0.3 mg/mL, hemoglobin up to 8.0 mg/mL and triglycerides up to 5.0 mg/mL.
– Clinical Specificity: 99 %
– Clinical Sensitivity: 100 %

REFERENCES

1. A meta-analysis on the EBV DNA and VCA IgA in diagnosis of Nasopharyngeal Carcinoma. Pak J Med Sci. (2013) 29 (3): 885-90. Review. Song C. and Yang S.
2. Correlation Analysis of Nasopharyngeal Carcinoma TNM Staging with Serum EA IgA and VCA IgA in EBV and VEGF-C and -D. Med Sci Monit. (2015) 21: 2105-9. Sun R., et al.
3. Expression of Serum Sialic Acid, Early Antigen-IgA, and Viral Capsid Antigen-IgA in Nasopharynx Cancer Patients: The Diagnostic Implication of Combined Assays. Med Sci Monit. (2015) 21: 4068-73. Sun Y., et al.
4. Development of a time-resolved fluoroimmunoassay for Epstein-Barr virus viral capsid antigen IgA antibody in human serum. J Virol Methods. (2015) 222: 16-21. Liang Q.N., et al.

OTHER RELATED ELISA KITS

• EBV VCA IgG ELISA Kit
• EBV VCA IgM ELISA Kit
• EBV EA IgA ELISA Kit