A Trial of Two Mask Systems in Preventing SARS CoV-2 in Healthcare Workers (HCW)

Inclusion Criteria: * Health care workers and allied health care staff working in COVID wards, COVID ICU, Non COVID ICU (This will include all specialty ICUs in the hospital), Casualty/Emergency, Operation Theatre and Pathology lab of the hospital * Health care workers and allied health care staff involved in performing high risk procedures like suctioning, intubation, nebulized medications, chest physiotherapy, other aerosol generating procedures and handling pathology samples * Negative COVID 19 RT-PCR test within last 3 days of screening * COVID 19 vaccinated or non-vaccinated Exclusion Criteria: * Unable or refused to consent * Current respiratory illness, rhinitis and/or allergy * Currently participating in any other clinical trial * Beard or facial hair