[island911]

Here is a bit that suggests that our immune systems will indeed mount a defense.

Is there an immunity? How long does it last?

The good news is that it is very likely there is an immunity. This is suggested by the proximity to other viruses, epidemiological data and animal experiments. Researchers infected four rhesus monkeys, a species close to humans, with SARS-CoV-2. The monkeys showed symptoms of COVID-19, the disease caused by the coronavirus, developed neutralizing antibodies and recovered after a few days. When the recovered animals were reinfected with the virus, they no longer developed any symptoms: They were immune.

https://www.msn.com/en-us/health/medical/the-immune-systems-fight-against-the-coronavirus/ar-BB12gJxx