Inclusion Criteria:  Due to have a coronavirus swab test or have had a swab test conducted in the previous 24 hours Aged ≥ 18 years Have suspected mild COVID-19 symptoms or have been exposed to COVID-19, or are NHS staff or household member of NHS staff No evidence of previous laboratory confirmed SARS-CoV-2 Written informed consent provided Willing and able to put a steril compresses for at least 4 h  Exclusion Criteria:  Aged < 18 years Written informed consent not provided Unable or unwilling to put a compresses for at least 4 h