Study of 355 confirmed COVID-19 cases as of February 16, 2020 with reproductive number of 2.28 (95% CI: 2.06, 2.52). This estimate was calculated during the "early phase" of the Diamond Princess outbreak.

Estimation of the reproductive number of novel coronavirus (COVID-19) and the probable outbreak size on the Diamond Princess cruise ship: A data-driven analysis

On the Diamond Princess cruise ship, an initial estimated $$R_0$$ of 14.8 (approximately 4 times higher than the $$R_0$$ in the epicenter of the outbreak in Wuhan, China) was reduced to an estimated reproductive number of 1.78 after on-board isolation and quarantine measures were implemented.

Effects of Countermeasures on the Reproductive Number for the Diamond Princess Cruise Ship

This node classifies studies estimating the COVID-19 reproductive number aboard the Diamond Princess cruise ship: a data-driven early-phase estimate of $$R_0 = 2.28$$ (95% CI: 2.06–2.52), and an analysis showing that onboard isolation and quarantine measures reduced the reproductive number from an initial estimate of $$R_0 = 14.8$$ to $$R_0 = 1.78$$.

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