re: There's a recent new study on the use of Ivermectin for Covid

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The cruise ship told us that the virus lasted 2+ weeks on surfaces.

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The cruise ship also had a 2% fatality rate

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Using the Diamond Princess data, a team reports in Eurosurveillance1 that by 20 February, 18% of all infected people on the ship had no symptoms. “That is a substantial number,” says co-author Gerardo Chowell, a mathematical epidemiologist at Georgia State University in Atlanta. But the passengers included a large number of elderly people, who are most likely to develop severe disease if infected, so the share of asymptomatic people in the general population is likely to be higher, he says.

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Another team used data from the ship to estimate2 that the proportion of deaths among confirmed cases in China, the case fatality rate (CFR), was around 1.1% — much lower than the 3.8% estimated by the World Health Organization (WHO).

The WHO simply divided China’s total number of deaths by the total number of confirmed infections, says Timothy Russell, a mathematical epidemiologist at the London School of Hygiene and Tropical Medicine. That method does not take into account that only a fraction of infected people are actually tested, and so it makes the disease seem more deadly than it is, he says.

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The group also estimates that the infection fatality rate (IFR) in China — the proportion of all infections, including asymptomatic ones, that result in death — is even lower, at roughly 0.5%.

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Ioannidis adds that the studies using Diamond Princess data could benefit from the addition of the medical histories of those on board, such as whether or not people smoked. “We know that not only age, but also presence of medical diseases such as chronic obstructive pulmonary disease, heart disease, diabetes and other conditions increase the risk of a bad outcome,” he says.

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