Sep 08, 2020
Version 1
Harmony Transfer Pipette Protocol V.1
- Jack H Kotnik1,
- Nuttada Panpradist1,
- Ian Hull1,
- Qin Wang1,
- Mike Roller1,
- Amy Oreskovic1,
- Enos Kline1,
- Daniel Leon1,
- Barry Lutz1,
- Robert Atkinson1
- 1University of Washington
- XPRIZE Rapid Covid Testing
Protocol Citation: Jack H Kotnik, Nuttada Panpradist, Ian Hull, Qin Wang, Mike Roller, Amy Oreskovic, Enos Kline, Daniel Leon, Barry Lutz, Robert Atkinson 2020. Harmony Transfer Pipette Protocol. protocols.io https://dx.doi.org/10.17504/protocols.io.bkvskw6e
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
We use this protocol and it's working
Created: September 04, 2020
Last Modified: September 08, 2020
Protocol Integer ID: 41618
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Materials
MATERIALS
Sterile Swab
Test Buffer (lysis buffer)
40 microliter Transfer Pipette
Reaction tube with LAMP reagents
Each test kit includes a sterile swab for sample collection, a vial of lysis buffer (test buffer) that contains detergents to help lyse the viruses and some salts needed in the reaction, a reaction tube with a dry reagent pellet containing the proper enzymes, ribonuclease inhibitors, primers and probes to sustain an RT-LAMP reaction, and a transfer pipette to transfer sample from the test buffer vial to the reaction tube. The reagents in the reaction tube amplify 3 unique regions of the SARS-CoV-2 genome and an internal amplification control (IAC).
Intended Use
Intended Use
The Harmony assay is used with the Harmony instrument for the detection of SARS-CoV-2 viral RNA in lower nares (nasal swab) specimens collected from individuals suspected of SARS-CoV-2 infection. The assay is intended for the qualitative detection of SARS-CoV-2 nucleic acid from direct specimens.The assay should not be used with specimens collected by other swabs not provided in the kits or specimens stored in Viral Transport Media (VTM), Universal Transport Media(UTM)or other media not provided in the kit.
The Harmony instrumentis small, fast (results within 60 minutes), and moderate-throughput (up to 4 samples per run). Results are for the identification of SARS-CoV-2 RNA. The SARS-CoV-2 RNA is generally detectable in nasal swab specimens during the acute phase of infection.
Principles of the Test
Principles of the Test
The Harmony assay uses loop-mediated isothermal amplification (LAMP) to detect viral RNA from the SARS-CoV-2 virus. The Harmony instrument consists of a touch screen display and a 4-well heating block/fluorescence reader. Each test kit includes a sterile swab for sample collection, a vial of lysis buffer (test buffer) that contains detergents to help lyse the viruses and some salts needed in the reaction, a reaction tube with a dry reagent pellet containing the proper enzymes, ribonuclease inhibitors, primers and probes to sustain an RT-LAMP reaction, and a transfer pipette to transfer sample from the test buffer vial to the reaction tube. The reagents in the reaction tube amplify 3 unique regions of the SARS-CoV-2 genome and an internal amplification control (IAC).
To perform the assay, a swab is collected from the patient’s nares.To prepare the sample, the swab is gently agitated in the lysis buffer container to release the sample. The transfer pipette is used to transfer a fixed volume of the lysed sample from the buffer container to the reaction tube, and the reaction tube is placed in the heater/reader. Software on the instrument interprets the fluorescent signal from the reader and calls each sample “Positive,” “Negative,” or “Failed” (when neither a viral target nor the IAC produces a signal).
General Precautions
General Precautions
- All patient specimens and positive controls should be considered potentially infectious and handled with appropriate caution. Refer to Interim Laboratory Biosafety Guidelines for Handling and Processing Specimens Associated with 2019-nCoV https://www.cdc.gov/coronavirus/2019-nCoV/lab-biosafety-guidelines.html.
- Use personal protective equipment such as (but not limited to) gloves, eye protection, and lab coats when handling kit reagents while performing this assay and handling materials including samples, reagents, pipettes, and other equipment and reagents.
- Always check the expiration date prior to use. Do not use expired reagents. Use of expired reagents may cause inaccurate results.
- During preparation of samples, fresh gloves should be used with each new sample to minimize the risk of introducing contaminants that degrade RNA or cross-contaminate samples.
- Keep reagent and reaction tubes capped or covered as much as possible.
- Work surfaces and the Harmony instrument should be cleaned and decontaminated with cleaning products such as 10% bleach or CDC approved decontaminants between each new sample to minimize risk of nucleic acid contamination. Residual bleach should be removed using 70% ethanol. The reaction tube holder can be detached and rinsed with soap water and let dry after each use.
- Never open the reaction tube after the completion of the run. The product after the run if spilled onto the surface can contaminate subsequent runs and cause false positive.
- Dispose of unused kit reagents and human specimens according to local, state, and federal regulations.
Built in Procedural Controls
Built in Procedural Controls
The Harmony assay uses an internal amplification control (IAC) in every test run. For test results to be valid, a SARS-CoV-2 target or the IAC must amplify. If neither are detected, the run result will be “failed”, and the test result is considered invalid and should be retested.
Sample Collection, Handling, and Storage
Sample Collection, Handling, and Storage
Each collection kit contains a sterile swab, a vial of test buffer, a reaction tube, and a transfer pipette. Harmony is intended to run fresh samples immediately or shortly after they are collected.
Specimens can be self-collected, collected under supervision, or collected by trained personnel. Using the sterile swab provided, follow the CDC recommended guidelines to collect a Lower Nares (Nasal Swab) specimen: Insert the swab at least 1 cm (0.5 inch) inside the nostril (naris) and firmly sample the nasal membrane by rotating the swab and leaving in place for 10 to 15 seconds; sample both nostrils with same swab (https://www.cdc.gov/coronavirus/2019-ncov/lab/guidelines-clinical-specimens.html#:~:text=Using%20a%20flocked%20or%20spun%20polyester%20swab%2C%20insert%20the%20swab,both%20nostrils%20with%20same%20swab.).
DO NOT place the swab into VTM or UTM or any buffer other than that provided in the kit because they will interfere with the assay. Samples stored in other media not provided in the kit should NOT be tested on the Harmony.
If the swab will not be immediately tested, return the swab to the foil pouch. Do NOT place the swab into VTM or UTM or any buffer other than that provided by the manufacturer. Samples may be stored dry for up to 2 hours at room temperature (15-30°C). If testing cannot be completed in that window, samples should be stored dry at 2-8°C for up to 24 hours. After the swabbed sample has been submerged in the test buffer vial, it can no longer be stored and the test procedure must be carried out immediately.
Test Procedure
Test Procedure
Check expiration date on each individual test package or outer box before using. Do not use any test past the expiration date on the label.
Handle all materials during sample preparation and testing as if they were infectious. Wear the appropriate personal protective equipment as recommended by the CDC, including powder-free latex or nitrile rubber gloves (full guidelines here: https://www.cdc.gov/coronavirus/2019-nCoV/lab/guidelines-clinical-specimens.html). To avoid cross-contamination, be sure to change gloves between test runs and decontaminate high-touch surfaces such as the tablet and the lid of the instrument between runs.
Instrument Preparation
Plug in the Harmony instrumentand turn it on. Be sure to allow at least 7 minutes for the instrument to heat to testing temperature. You may proceed to sample preparation after turning the instrument on while the instrument is heating. The device will not allow you to proceed with loading the samples if the instrument is not at temperature. If the instrument is already turned on and at temperature, you may skip this step.
00:07:00 if the instrument is cold.
Sample preparation and set-up
Remove the reaction tube from the foil pouch labelled “reaction tube.” Place it in the smaller well of the sample prep block attached to the Harmony instrument.
Remove the vial of test buffer from the foil pouch labelled “test buffer.” Take the cap off and place the vial in the larger well of the sample prep block.
Submerge the patient swab (after collecting the patient nasal sample) in the test buffer and swirl it 5 times, pressing it against the sides of the vial.
Leave the swab in the test buffer for 30 seconds.
00:00:30
Rotate the swab head against the inside of the vial as you remove it. Dispose of the swab in a biohazardous waste container.
Sample Transfer
Use the transfer pipette to transfer fluid from the vial to the tube.
FIRMLY squeeze the top bulb of the transfer pipette.
Still squeezing, place the pipette tip into the test buffer vial.
With the pipette tip still in the test buffer vial, slowly release the pressure on the bulb of the transfer pipette. NOTE: some liquid will flow into the lower bulb of the pipette – this is okay!
Remove the pipette from the test buffer and place the pipette tip into the reaction tube.
Firmly but slowly squeeze the top bulb of the pipette to empty the contents of the 40 microliter fixed volume pipette into the reaction tube. STILL SQUEEZING, remove the pipette from the reaction tube.
40 µL or 1 fixed volume transfer pipette
Note: The fixed-volume transfer pipette is designed to collect an excess of liquid sample and dispense the correct volume of liquid sample into the reaction tube. Do not try to add fluid left in the lower “overflow” reservoir to the reaction tube. Discard the pipette in the biohazard waste.
Screw the cap back onto the vial of test buffer. Discard this in the biohazardous waste.
Close the reaction tube.
Do not place the sample into the heater/reader unit of the instrument until all samples for this run are ready. Samples should be placed in the wells at the same time and the lid should be closed immediately to start the test run.
If you only intend to run one sample, you may proceed to the onscreen instructions on the Harmony instrument. Otherwise, set this sample in the sample queue block and repeat the "Test Procedure" section for each additional sample. Do NOT set the sample in the heater/reader until you are ready to start the run.
Be sure to change gloves for each sample, and before using the touch screen on the instrument.
go to step #6 ONLY if preparing additional samples for testing. Otherwise proceed to step 13.
On-Screen Instructions
On-Screen Instructions
The Harmony touch screen display will guide you through the steps to load the samples into the instrument. The software supports three methods of sample identification: manual text entry of an alphanumeric sample ID, photographing a barcode that can be read by instrument software, or photographing the patient directly. Please choose the method most suited to your institution’s sample tracking systems and compliant with your institution’s privacy and data security guidelines.