“Infectious disease experts knew this year might be an outlier. Covid-19 has been the biggest disruption to the normal cycle of disease in a century, and we know from prior experience that major pandemics can be followed by a year or two of chaotic viral behavior before settling into a more normal pattern. It happened with both the 1918 flu and the 2009 H1N1 pandemic.
For RSV and influenza, the past two years have been aberrations; it is reasonable to expect more normal patterns will resume in the future as immunity builds back up. (Still, every cold-and-flu season will be different — variation from season to season is a constant.)
“My guess is that this is entirely temporary and things will settle down into more routine patterns in coming seasons as typical population immunity gets back on track,” said Richard Webby, an infectious disease researcher at St. Jude Children’s Research Hospital.Covid-19 is trickier to project, given its continuing evolution toward more transmissibility. So far, the protection from prior infection and vaccines seems to be effective for most people, at least in preventing them from ending up in the hospital. But it also continues to pose a threat to the unvaccinated, the elderly, and the immunocompromised — and yearly surges when the conditions are more favorable for viral spread (i.e., the winter) are to be expected.”