Once you’re immune and the virus is defeated internally, there won’t be more viral pieces to shed and infect others. You could still handle virus portions and pass them along, but you wouldn’t be generating any yourself.
BTW, it’s expected that recovery will provide immunity at least for a while, but this hasn’t been tested or confirmed. But the concept of “herd immunity” is based on this.
OTOH, the annual flu shot is because each year the common flu mutates slightly or has its origin from a different area and is slightly different. The “novel corona virus” is new (novel) and so nobody has preexisting immunity to it.
[This graph](https://cnx.org/resources/567ad79b5a158e6b717fcccbc748466c/Figure_42_02_10.jpg) illustrates it nicely.
The first time you are exposed to something, your immune system is slow to respond and the response itself is small. The immune system has a memory, so the second time you are exposed to something the immune system will recognise it and the response is immediate and big. This can clear up the pathogen before you get sick so you may not even notice you were re-exposed. If it can’t take hold then you’re not carrying it around either.
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