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CORONAVIRUSES (HCoVs) BEFORE SARSCov2: "The percentage of positive tests peaked during December - March each year..a significant difference in age distribution was noted. Conclusions: 
Common HCoVs may have annual peaks of circulation in winter months
" https://pubmed.ncbi.nlm.nih.gov/29427907/
Common HCoVs may have annual peaks of circulation in winter months" https://pubmed.ncbi.nlm.nih.gov/29427907/
"Human coronaviruses (HCoVs) -OC43, -229E, -NL63 and -HKU1 cause upper and lower respiratory tract infections. HCoVs are globally distributed and the predominant species may vary by region or year."
The percentage of tests positive for human coronaviruses (HCoVs) -OC43, -NL63, -229E, and -HKU1 reported to the National Respiratory and Enteric Viruses Surveillance System (NREVSS) by week, stratified by US Census Region, July 2014–June 2017.
Age distribution of human coronaviruses (HCoVs) -229E, -HKU1, -NL63 & -OC43 positive tests with age available reported to NREVSS via the Public Health Laboratory Interoperability Project (PHLIP), from July 2014–June 2017. Specimens with more than one coronavirus detected excluded
