<unk>  is one of the seven human coronaviruses which include HCoV-NL63, HCoV-OC43, HCoV-HKU1, MERS-CoV, SARS-CoV-1, and SARS-CoV-2 and are globally distributed. However, the viruses were detected in different parts of the world at different times of the year. A NCBI-study found a previous<unk>  infection in 42.9% – 50.0% of children of 6–12 months of age and in 65% of those 2.5–3.5 years of age.
Human coronavirus 229E
Influenza D virus
Human coronavirus OC43
Human coronavirus NL63
Human coronavirus HKU1
Influenza B virus
Influenza A virus
ZyCoV-D