When were the first human #coronaviruses (CoVs) discovered and studied?
How were these viruses associated with human #disease?
It's time to learn our history about human CoVs, and the scientists and volunteers that allowed us to identify this new group of viruses.
A THREAD.
How were these viruses associated with human #disease?
It's time to learn our history about human CoVs, and the scientists and volunteers that allowed us to identify this new group of viruses.
A THREAD.
Mid-sixties: HCoV-229E and HCoV-OC43 were identified.
1. Hamre et al. (1966)
2. McIntosh et al. (1967)
3. Tyrrell et al. (1965).
Image: Tyrrell et al. (1965).
1. Hamre et al. (1966)
2. McIntosh et al. (1967)
3. Tyrrell et al. (1965).
Image: Tyrrell et al. (1965).
Healthy HUMAN volunteers were infected to demonstrate that 229E and OC43 resulted in a common cold.
1. Bradburne et al. (1967, 1972)
2. Hamre et al. (1966)
Image: Bradburne et al. (1967)
1. Bradburne et al. (1967, 1972)
2. Hamre et al. (1966)
Image: Bradburne et al. (1967)
Both 229E and OC43 were considered harmless or low pathogenic for humans.
This changed when #SARSCoV emerged in November 2002. This new #CoV caused severe respiratory disease.
1. Peiris et al. (2003): https://www.nejm.org/doi/full/10.1056/NEJMra032498
This changed when #SARSCoV emerged in November 2002. This new #CoV caused severe respiratory disease.
1. Peiris et al. (2003): https://www.nejm.org/doi/full/10.1056/NEJMra032498
Later, two additional #CoVs were discovered in humans.
1. HCoV-NL63 (van der Hoek et al., 2004)
2. HCoV-HKU1 (Woo et al., 2005)
Image: van der Hoek et al. (2004)
1. HCoV-NL63 (van der Hoek et al., 2004)
2. HCoV-HKU1 (Woo et al., 2005)
Image: van der Hoek et al. (2004)
These were followed by #MERSCoV and #SARSCoV2 in 2012 and 2019, respectively.
1. MERSCoV first report: Zaki et al. (2012)
2. #SARSCoV2 first report: Zhou et al. Nature, 2020 (but there could be other simultaneous reports)
Image: Zaki et al. NEJM (2012)
1. MERSCoV first report: Zaki et al. (2012)
2. #SARSCoV2 first report: Zhou et al. Nature, 2020 (but there could be other simultaneous reports)
Image: Zaki et al. NEJM (2012)
I still have questions about why some human CoVs are low pathogenic, while others cause more severe disease. Site of replication? Ease of transmission/immune modulation? Feel free to chime in.