In contrast to antibody-mediated immunity, T-cell response is extremely long-lived. For example, people infected in 2003 with SARS-1 still mount an immune response to #SARSCoV2 17 years later.
(10/13)

While there is still no established case of #SARSCoV2 reinfection to date, it is likely those will be observed soon due to fairly fast waning antibodies. Though, anyone with a prior exposure to #SARSCoV2 is expected to experience far less severe symptoms upon reinfection.
(11/13)

Most 'hight-tech' vaccines tend to focus on eliciting narrow antibody responses. T-cell response works best against the whole viral diversity. This raises the question whether there should not be more efforts towards 'traditional' vaccines (i.e. attenuated/inactivated).
(12/13)

To finish on a lighter note, given how little we still know about the best-studied virus ever, it amuses me to no end that some believe it might have been cunningly engineered by nefarious boffins to target ethnic group X or Y, or behave in the way it does.
(13/13)

I'm afraid there's no evidence for cross-immunity between influenza and coronaviruses. There's actually not even much cross-immunity between different lineages of influenza, which is a diverse group of viruses (see below). https://twitter.com/BallouxFrancois/status/1274971066620956672