Sequential HCoV-HKU1 and SARS-CoV-2 Infections, a Case Report

In the SARS-CoV-2 pandemic, the seasonal viral respiratory infections had a minimum prevalence due to public health precautions to reduce the risk of getting Coronavirus Disease 19 (COVID-19). There have been reports of COVID-19 coinfection with influenza, respiratory syncytial virus (RSV), and seasonal coronaviruses during the pandemic. Here, we report a case in which the patient had sequential respiratory infections of human coronavirus HKU1 (HCoV-HKU1) and SARS-CoV-2 in a fully vaccinated, healthy person. It should be noted that other seasonal coronaviruses that could cause symptomatic RTIs might be misdiagnosed clinically with COVID-19. Hence, we highly recommend monitoring and follow-up of symptomatic patients with negative SARS-COV-2 RT-PCR results.