The goal of this observational study is to validate the use of less invasive samples (saliva, orobuccal or nasal swabs) than nasopharyngeal swab for testing common and clinically relevant respiratory viruses in children and adults presenting to an emergency departements with symptoms compatible with respiratory tract infection. The main question it aims to answer is: \- Is the precision of reverse transcription polymerase chain reaction (RT-PCR) for Influenzavirus A or B, respiratory syncytial virus (RSV), and Rhinovirus, on saliva, orobuccal swabs and nasal swabs comparable to the gold standard nasopharyngeal swab in a pediatric and adult population presenting with symptoms compatible with respiratory tract infection. Among participants the following samples will be collected (nasopharyngeal swab is standard of care and not part of the study samples): * Saliva * Orobuccal swab * Nasal swab
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Sensitivity of RT-PCR for Influenzavirus A or B, RSV and Rhinovirus, on orobuccal or nasal swab and saliva compared to nasopharyngeal swab.
Timeframe: At baseline
Specificity of RT-PCR for Influenzavirus A or B, RSV and Rhinovirus, on orobuccal or nasal swab and saliva compared to nasopharyngeal swab.
Timeframe: At baseline