For anosmic patients/healthy controls:  Inclusion criteria  Known anosmia (for anosmic patients only) Age greater than or equal to 18 Access to phone, tablet or computer connected to the internet.  Exclusion criteria  Known odor-evoked adverse effects, e.g. asthma. No known history of SARS-CoV-2 and or other respiratory illness (healthy controls only)  For asymptomatic participants:  Inclusion criteria  No symptoms of COVID infection at the time of enrollment. Age greater than or equal to 18 Access to phone, tablet or computer connected to the internet.  Exclusion criteria  Known odor-evoked adverse effects, e.g. asthma. Prior known smell or taste disorder  For symptomatic patients:  Inclusion criteria  Potential or definite exposure to SARS-CoV-2 virus Symptoms of upper respiratory infection (smell loss, taste loss, fever, myalgia, cough, nasal congestion, runny nose, shortness of breath) Age greater than or equal to 18 Access to phone, tablet or computer connected to the internet.  Exclusion criteria  Known odor-evoked adverse effects, e.g. asthma. Prior known smell or taste disorder