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HelpTest Code CHIKC Chikungunya Virus, PCR, Molecular Detection, Spinal Fluid
Additional Testing Requirements
Due to the short period in which chikungunya RNA may be detected in cerebrospinal fluid (CSF), testing serum for IgM- and IgG-class antibodies to chikungunya virus is also recommended. See CHIKV / Chikungunya IgM and IgG, Antibody, Serum.
Specimen Required
Collection Container/Tube: Vial number 2
Submission Container/Tube: Sterile screw cap vial
Specimen Volume: 0.5 mL
Collection Instructions: Do not centrifuge or heat inactivate.
Useful For
Qualitative detection of chikungunya virus in cerebrospinal fluid after early symptom onset (ideally <7 days)
This test is not recommended for screening healthy patients.
Method Name
Real-Time Reverse Transcription Polymerase Chain Reaction (RT-PCR)/DNA Probe Hybridization
Reporting Name
Chikungunya Virus, PCR, CSFSpecimen Type
CSFSpecimen Minimum Volume
0.3 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| CSF | Refrigerated (preferred) | 7 days | |
| Frozen | 7 days |
Reject Due To
| Heat-inactivated specimen | Reject |
Clinical Information
Chikungunya virus (CHIK) is an RNA virus of the genus Alphavirus, family Togaviridae transmitted mainly through the bite of infected mosquitoes in the genus Aedes (Aedes aegypti and Aedes albopictus). This is the same mosquito that transmits dengue, yellow fever, and Zika viruses. Most people infected with chikungunya virus will develop some symptoms, most commonly fever and joint pain. There is no specific antiviral treatment for chikungunya virus infection.
Most cases of disease have occurred in Africa, Asia, Europe, and the Indian and Pacific Oceans, but transmission of CHIK has been identified in Caribbean countries and South American regions, as well as foci in the southern United States. Infection with chikungunya virus may be suspected based on symptoms (fever, joint pain, and headache) and recent history of travel. A diagnosis of CHIK infection can be confirmed through laboratory tests on serum or cerebrospinal fluid.
This assay is designed to detect only species of clinical significance and is to be used for patients with a clinical history and symptoms consistent with chikungunya infection.
Reference Values
Negative
Reference values apply to all ages.
Interpretation
A positive test result indicates the presence of chikungunya virus RNA in the specimen.
A negative test result with a positive internal control indicates that chikungunya virus RNA is not detectable in the specimen.
A negative test result with a negative internal control is considered evidence of polymerase chain reaction inhibition or reagent failure. A new specimen should be collected for testing if clinically indicated.
Cautions
This assay is designed to be used for patients with a clinical history and symptoms consistent with chikungunya infection.
Negative chikungunya virus real-time reverse transcription polymerase chain reaction results do not preclude infection with chikungunya virus and should not be used as the sole basis for patient treatment or management decisions. All results should be interpreted by a trained professional in conjunction with review of the patient's exposure history and clinical signs and symptoms.
False-negative results may arise from degradation of chikungunya virus RNA during incorrect shipping or storage, and specimen collection after the period that chikungunya virus RNA is typically found in the patient (7 days after onset of symptoms).
Supportive Data
The following validation data supports the use of this assay for clinical testing.
Accuracy/Diagnostic Sensitivity and Specificity:
Clinical specimens, commercial samples, and a blinded panel of positive and negative samples provided by the Centers for Disease Control and Prevention (CDC) were used for the accuracy experiments. Testing was completed per the manufacturer's instructions, using the easy Mag (bioMerieux) for RNA extraction.
-Ninety-five clinical serum specimens received from the Mayo Infectious Disease Serology Laboratory (IDS) were tested using the Altona RealStar (ARS) Chikungunya (CHIK) RT-PCR Kit 2.0 assay. These specimens had been submitted through Mayo Clinic Laboratories and sent to an external laboratory for serology (IgM IFA) and reverse transcription polymerase chain reaction (RT-PCR) testing in 2014.
-Sixteen vials of human plasma from donor units collected in Puerto Rico extracted using the QIAGEN QIAamp Viral RNA Mini Kit.
-Spiking studies: To supplement the results, negative cerebrospinal fluid (CSF) specimens were spiked with viral RNA of CHIK and tested in a blinded fashion. The spiking material was heat inactivated (HI) CHIK culture fluid (CF). The ARS CHIK results were compared to the consensus results of the ARS CHIK, a published assay by Lanciotti(1) and a commercial assay, the Bio-Rad ZDC Multiplex RT-PCR Assay (ZDC). The gold standard was considered the consensus between 2 of the 3 PCR assays.
Results:
The ARS CHIK RT-PCR Kit detected 9 more chikungunya virus-positive specimens from the patient samples received from IDS than the Lanciotti and ZDC RT-PCR assays.
-Eight of the nine ARS CHIK+/Lanciotti-/ZDC- results were positive by chikungunya IgM EIA and/or chikungunya RT-PCR at another commercial reference lab, and therefore considered likely true positives. Final consensus sensitivity and specificity were 100% and 98% respectively.
-There was 100% agreement with among the ARS CHIK, Lanciotti, and CDC Trioplex RT-PCR assays using a CDC validation panel.
-The CSF specimens spiked with HI chikungunya virus CF at low concentrations gave expected results in 44/44 specimens.
Analytical Specificity:
No cross-reactivity was observed with the ARS CHIK RT-PCR Kit when tested against a comprehensive specificity panel, which included 32 bacterial, fungal, and viral organisms from culture collections along with well characterized laboratory strains causing similar disease states, closely related organisms, or from organisms commonly found in the specimens tested. This included West Nile virus (lineage 1 and 2), dengue virus (types 1, 2, 3, and 4), tick-borne encephalitis virus, yellow fever virus, Japanese encephalitis virus, Zika virus, and poliovirus. The manufacturer tested additional organisms as listed in the package insert.
Method Description
The RealStar Chikungunya Virus RT-PCR Kit was developed by Altona Diagnostics to assist in the diagnosis of chikungunya (CHIK) infection by testing cerebrospinal fluid for CHIK RNA. The Altona RealStar Chikungunya (ARS CHIK) RT-PCR Kit 2.0 is a qualitative reverse transcription-PCR (RT-PCR) assay targeting the nonstructural protein 1 (NS1) gene. The assay includes a heterologous amplification system (internal control: IC) to identify possible RT-PCR inhibition and to confirm the integrity of the reagents of the kit. Testing will be performed per the manufacturer's instructions using the LightCycler 480 following extraction with the NucliSENS easyMag (bioMerieux).
Real-time RT-PCR technology utilizes a reverse-transcriptase reaction to convert RNA into complementary DNA, PCR for the amplification of specific target sequences, and target specific probes for the detection of the amplified DNA. The probes are labelled with fluorescent reporter and quencher dyes. Probes specific for CHIK RNA are labelled with the fluorophore FAM. The probe specific for the IC is labeled with the fluorophore JOE. Using probes linked to distinguishable dyes enables the parallel detection of CHIK specific RNA and the IC in corresponding detector channels of the real-time PCR instrument.(Package insert: RealStar Chikungunya RT-PCR Kit 2.0. Altona Diagnostics; 01/2017)
Day(s) Performed
Tuesday, Thursday
Report Available
Same day/1 to 5 daysSpecimen Retention Time
7 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
87798
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CHIKC | Chikungunya Virus, PCR, CSF | 81153-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 603832 | Chikungunya Virus, PCR, CSF | 81153-9 |
Testing Algorithm
For more information see Mosquito-borne Disease Laboratory Testing
Special Instructions
Forms
If not ordering electronically, complete, print, and send a Microbiology Test Request (T244) with the specimen.