We Need More Coronavirus Testing. Are Antigen Tests The Answer?

Diagnostic Tests

Diagnostic tests, primarily PCR tests, are crucial for identifying active coronavirus infections. Rob Stein explains that these tests detect specific genetic sequences of the virus, making them highly reliable, though they may take a few days to show results 1. Maddie Sofia adds that PCR tests are the most common diagnostic tools, but they require time for the virus to appear in detectable amounts in the body 1.

PCR tests work by looking for a specific sequence of genetic code that belongs to the coronavirus.

--- Maddie Sofia

Despite their reliability, the delay in results can hinder immediate decision-making in pandemic management.

   

Antigen Tests

Antigen tests offer a faster and cheaper alternative to PCR tests, detecting viral proteins instead of genetic material. Rob Stein notes that these tests, recently approved by the FDA, are similar to those used for flu and strep throat, providing quick results 2. However, they are less reliable, potentially missing 15-20% of infections 3.

They're cheap, they're fast, and public health officials say they could be the key to getting our testing capacity to the next level.

--- Rob Stein

The speed and cost-effectiveness of antigen tests could significantly boost testing capacity, but their lower accuracy remains a concern.

   

Antibody Tests

Antibody tests, unlike diagnostic tests, determine past infections by detecting antibodies in the blood. Rob Stein explains that these tests can indicate some level of immunity, although the duration and strength of this immunity are still uncertain 4. Maddie Sofia highlights that while useful for understanding virus spread, antibody tests can give false positives, sometimes detecting antibodies for other coronaviruses 4.

An antibody test, right now, it's unclear how reliable they are.

--- Rob Stein

Despite these limitations, antibody tests are valuable for public health insights into community spread.