Inclusion Criteria:  Symptomatic and requiring a COVID-19 test at RCH or confirmed/suspected COVID-19 at home. Aged between 4-18 years old. Parent/guardian present. Parents/self are able to provide consent.  Exclusion Criteria:  <4 years old, or >18 years old. Previous head or neck surgery resulting in the absence of a nasal cavity (e.g. rhinectomy). Inability (e.g. non-English speaking) or unwillingness to consent