Estimating time-varying epidemiological parameters and underreporting of Covid-19 cases in Brazil using a mathematical model with fuzzy transitions between epidemic periods.

PLoS One · 2024 · PMC11182538 · PMID 38885221

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an increasing trendno p-value reported

The initial immunity period was estimated to be 234 days (95% CI: 206–262), exhibiting an increasing trend, albeit with a reduction observed in mid-2021.

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