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DiagnosDisk - a highly sensitive point-of-care test for detecting SARS-CoV-2antigen in saliva

Award Number: R21AI163282
ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

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Project Summary/Abstract SARS-CoV-2, a global pandemic, has caused more than 6 million infections and 180,000 deaths in the United States alone during the past 7 months. Both the WHO and CDC emphasize the need for point-of-care (POC) tests to expand diagnosis of acute infections to control the pandemic (i.e. isolating infected individuals). The current gold standard test for diagnosing acute SARS-CoV-2 infection is reverse transcriptase polymerase chain reaction (RT-PCR) with nasopharyngeal samples. The assay is highly sensitive, but requires well-trained personnel for sample collection and locations with specialized equipment. Therefore, the turnaround time varies from one to few days, delaying isolation, contact tracing, and medical attention. These challenges can be addressed with lateral flow immunoassays (LFIA) to detect viral antigens in self-collected saliva samples. Compared to nasopharyngeal specimens, studies have demonstrated that assays with saliva samples are more consistent and the saliva itself may contain higher viral load. However, existing LFIA for detecting salivary antigens exhibit poor sensitivity (= 40%) caused by the use of small sample volumes and sample dilution. To achieve timely and accurate screening of suspected COVID-19 cases, this project aims to develop a rapid assay for detecting SARS-CoV-2 antigens in saliva with high sensitivity to meet WHO's target product profile. We hypothesize that using =500 µL saliva as the assay sample can significantly improve the sensitivity because a larger specimen volume provides more analytes for detection. The new test will employ temperature-responsive polymer-antibody conjugates in conjunction with DiagnosDisk, a novel flow-through assay device. The approach is innovative in in using enriched saliva specimens for more consistent assay results, enhancing antigen detection by scaling up the saliva specimen volume, and adopting the well- developed sandwich immunoassay for DiagnosDisk with temperature-responsive polymer reagents that simplify the design while maximizing the sensitivity. We will employ polymer-antibody conjugates that efficiently isolate analytes in saliva (Aim 1) and fabricate the DiagnosDisk device to accommodate larger volume saliva specimens to improve the detection limit (Aim 2). The sensitivity of the new rapid assay, which combines polymer-antibody conjugates and DiagnosDisk, will be evaluated using saliva specimens from COVID-19 positive and negative patients (Aim 3).


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2023 ( Subtotal = $0 )
2023	2022	NATIONAL TAIWAN UNIVERSITY OF SCIENCE AND TECHNOLONGY	NO. 43, KEELUNG RD., SEC. 4	TAIPEI CITY				TWN	Allergy and Infectious Diseases Research	001	2	3/30/2023	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	$119,694
2023	2021	UNIVERSITY OF WASHINGTON	4333 BROOKLYN AVE NE	SEATTLE	WA	98195	KING	USA	Allergy and Infectious Diseases Research	000	1	3/30/2023	NEW	-$119,694
														Subtotal = $0

Issue Date FY: 2022 ( Subtotal = $134,168 )
2022	2022	NATIONAL TAIWAN UNIVERSITY OF SCIENCE AND TECHNOLOGY	NO. 43, KEELUNG RD., SEC. 4	TAIPEI CITY				TWN	Allergy and Infectious Diseases Research	001	2	8/11/2022	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	$134,168
2022	2021	UNIVERSITY OF WASHINGTON	4333 BROOKLYN AVE NE	SEATTLE	WA	98195	KING	USA	Allergy and Infectious Diseases Research	000	1	8/10/2022	NEW	$0
														Subtotal = $134,168

Issue Date FY: 2021 ( Subtotal = $233,250 )
2021	2021	UNIVERSITY OF WASHINGTON	4333 BROOKLYN AVE NE	SEATTLE	WA	98195	KING	USA	Allergy and Infectious Diseases Research	000	1	6/25/2021	NEW	$233,250
														Subtotal = $233,250

Grand Total All Awards = $367,418

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DiagnosDisk - a highly sensitive point-of-care test for detecting SARS-CoV-2antigen in saliva

Award Number: R21AI163282

ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

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