LIAISON NES Influenza (FLU) A/B, Respiratory Syncytial Virus (RSV), & Coronavirus Disease 2019 (COVID-19) in Symptomatic Patients in Australia

Inclusion Criteria: * Human patients with active signs and symptoms of respiratory tract infection at time of collection * Specimens collected within 7 days of symptom onset for the initial collection * Patient consents to participate in the study * Availability of age, gender, race, ethnicity, collection dates, collection time, routine respiratory testing method, routine respiratory result, signs and symptoms (e.g., fever), date of symptom onset for each symptom, vaccination status (Flu and COVID-19, as applicable), pre-existing medical conditions (as applicable), medications (e.g., COVID-19 antivirals), etc. for each subject Exclusion Criteria: * Incorrect swab type * Incorrect transport media * Incorrect specimen handling (specimens not stored at recommended temperature) * Samples collected \>7 days from symptom onset * Subject does not provide informed consent or subject withdraws informed consent