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Three covid rapid antigen tests displaying (left to right) invalid, positive, and negative results.
What Does a Positive Covid Test Look Like?
Lateral flow tests for COVID-19 can be very accurate and specific when used as directed, but introducing acidic fluids can cause the tests’ detecting antibodies to clump, which may read as a positive result.
What Does a Positive Covid Test Look Like?
What Does a Positive Covid Test Look Like?

Lateral flow tests for COVID-19 can be very accurate and specific when used as directed, but introducing acidic fluids can cause the tests’ detecting antibodies to clump, which may read as a positive result.

Lateral flow tests for COVID-19 can be very accurate and specific when used as directed, but introducing acidic fluids can cause the tests’ detecting antibodies to clump, which may read as a positive result.

rapid COVID-19 test

Accessible Lateral Flow Assays: Test to Treat, Test to Protect
Deanna MacNeil, PhD | Oct 18, 2023 | 3 min read
From development to implementation, Rosanna Peeling discusses the importance of rapid tests for public health.
Man in lab coat looking at the camera and smiling
Can Taking a Test Now Tell You if You’ve Already Had COVID-19?
Natalia Mesa, PhD | Aug 8, 2022 | 4 min read
The Scientist asks Brigham and Women’s Hospital infectious disease specialist Lindsey Baden about testing for prior infections.
an artistic rendering of CRISPR/Cas9
Ten Years of CRISPR
Sophie Fessl, PhD | Jun 28, 2022 | 7 min read
This month marks ten years since CRISPR-Cas9 was repurposed as a gene editing system, so we’re looking back at what has been accomplished in a decade of CRISPR editing.
Woman in face shield and blue gown taking cotton swab of patient's mouth while patient sits inside of car
What You Should Know About New Omicron Subvariants
Natalia Mesa, PhD | May 17, 2022 | 6 min read
The presence and spread of new, more-infectious and immune-evading variants show that the coronavirus is not done mutating.
Illustration of man receiving a COVID test.
Opinion: What COVID-19 Has Taught Us About the Importance of Testing
Mark Kessel | Feb 1, 2022 | 5 min read
The pandemic has yielded many lessons. One is that adequate and well-distributed diagnostics are key to battling disease outbreaks.
Learn About Selecting Probes for Lateral Flow Assays
Choosing the Right Nanoparticle Probe for SARS-CoV-2 Lateral Flow Assays
nanoComposix | Jan 19, 2022 | 1 min read
Performance-based pros and cons of common nanoparticle probes
Rapid antigen tests for SARS-CoV-2
Are Rapid Tests Worse at Detecting Omicron—and Does It Matter?
Catherine Offord | Jan 14, 2022 | 10 min read
Anecdotal reports and results from small studies on the diagnostics’ accuracy have prompted questions about the devices’ usage with the new variant, but researchers say more data are needed and emphasize the continued importance of SARS-CoV-2 testing.
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