Study finds decline in performance of some COVID-19 home testing kits during omicron period bmj_latest
, show that performance improved when tests used both nose and throat samples compared with nasal samples only. and at least 97% specificity among individuals with symptoms.
To fill this knowledge gap, researchers compared the performances of three commercially available rapid antigen tests: Flowflex , MPBio and Clinitest , during the omicron period of the COVID-19 pandemic. Nasal self-sampling was used during the emergence of omicron, and when omicron accounted for more than 90% of infections and combined throat and nasal self-sampling was used when omicron accounted for more than 99% of infections .
Only the MPBio test with combined throat and nasal self-sampling met the World Health Organization's standards for rapid antigen tests among individuals with symptoms. However, the authors point out that the omicron variant was present in at least 90% of samples in both periods and therefore do not expect that the sampling method of the reference test substantially impacted their results or their generalizability.
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