Model projections show that production of high-value products from microalgae could be profitable nowadays and commodities will become profitable within 10 years.

Stay-at-home orders, physical distancing, face masks and other non-pharmaceutical interventions (NPIs) do not only impact COVID-19, but also the dynamics of various other infectious diseases. Bronchiolitis is a clinically diagnosed viral infection of the lower respiratory tract, and causes a yearly seasonal wave of admissions in paediatric wards worldwide. We counted 92,5% less bronchiolitis hospitalisations in Antwerp before the expected end of the peak this year (of which only 1 RSV positive), as compared to the last 3 years. Furthermore, there was a >99% reduction in the number of registered RSV cases in Belgium.Conslusion: The 2020 winter bronchiolitis peak is hitherto nonexistent, but we fear a 'delayed' spring/summer bronchiolitis peak when most NPIs will be relaxed and pre-pandemic life restarts.

The positive predictive value for AASRD was higher for EliA than for IIF, but, depending on the disease, EliA might fail to detect antibodies that are detected by IIF. Combining immunoassay with IIF adds value.

Acknowledgements We thank Laura Hendrickx, Marie-Christine Clukkers and Silke Willebrords for expert technical assistance. Contributors PW reviewed all the medical records of the patients included and performed the analysis. EDL, RW, SV and DB took care of the patients and helped with clinical classification of the patients. XB wrote a draft of the manuscript. All authors reviewed the draft and approved the submission of the manuscript.

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