nostr:npub1qe3x8fa4hxn7ry9ghe9e8p4khffvsdjmt9jjjg3nh8p9chu8q7wqtyy8hj Only for about  3-4months and incomplete due to variant mutation. 

Thats the quick and dirty. 

Coronaviruses generally dont build durable immunity like Measles or ChickenPox. And durable immunity still isnt guaranteed in those situations, hence a series of vaccines