Question

Which of the following would you expect for a SARS-CoV-2 variant that is classified as a variant of interest? (Select all that apply.)
a. The isolated virus is genetically unique as compared to earlier circulating versions of SARS-CoV-2.
b. There is evidence that the variant completely evades vaccine-induced immunity.
c. The variant is broadly detectable with current diagnostic tools.
d. The variant can cause viral pneumonia.
e. Infections caused by the variant are not treatable with existing approved drug therapies.

Accepted Answer

Step 1: Understand the definition of a 'variant of interest' (VOI) in the context of SARS-CoV-2. A VOI is a variant with genetic changes that are predicted or known to affect virus characteristics such as transmissibility, disease severity, immune escape, diagnostic or therapeutic escape, but evidence is still emerging. Step 2: Evaluate option (a): A VOI is expected to be genetically unique compared to earlier circulating versions, as this genetic uniqueness is what flags it for further monitoring. Step 3: Evaluate option (b): Complete evasion of vaccine-induced immunity is a more severe characteristic and is typically associated with a 'variant of concern' (VOC), not just a VOI, so this is less likely for a VOI. Step 4: Evaluate option (c): A VOI should still be broadly detectable with current diagnostic tools, as loss of detectability would be a significant concern and might elevate the variant to VOC status. Step 5: Evaluate options (d) and (e): Causing viral pneumonia and resistance to existing approved drug therapies are serious clinical impacts usually associated with VOCs rather than VOIs, so these are less expected for a VOI.

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Concetti chiave

Variant Classification in SARS-CoV-2

Impact of Variants on Immunity and Diagnostics

Clinical and Therapeutic Implications of Variants