The IBV-like novel cold viruses were soon shown to be also morphologically related to the mouse hepatitis virus.[1] This new group of IBV-like viruses came to be known as coronaviruses after their distinctive morphological appearance.[2] Human coronavirus 229E and human coronavirus OC43 continued to be studied in subsequent decades.[37][38] The coronavirus strain B814 was lost. It is not known which present human coronavirus it was.[39] Other human coronaviruses have since been identified, including SARS-CoV in 2003, HCoV NL63 in 2004, HCoV HKU1 in 2005, MERS-CoV in 2012, and SARS-CoV-2 in 2019.[40][41] There have also been a large number of animal coronaviruses identified since the 1960s.[8]