How many people are Covid-19 immune? Diamond Princess case study

Diamond Princess was the first quarantined cruise ship due to the corona COVID-19 virus. All of 3710 people on board were trapped at Diamond Princess for at least 20 days. Virus was spreading rapidly due to the low hygiene and defective coronavirus counter-measures on the ship. At some point, virus stopped spreading exponentially. Only 19% of people onboard were infected. The rest may have shown no symptoms or have been totally immune. This study compares real cases vs. exponential models...

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