[NOTE: Part I can be found here.]
While musing about COVID-19, I wondered whether the virus really is novel. Perhaps it’s been around for a while and just wasn’t causing all that many deaths and therefore wasn’t even noticed until the spike occurred in China. Now that the virus has been recognized and is being tested for, perhaps we’re finding it all over the place (in small quantities so far) because it’s long been all over place and not caused all that much damage.
This seemed an odd thought. But it turns out it’s not so odd after all:
…”[H]as this virus ever entered the population undetected and been spreading?” asks Andrew Pekosz, a biologist at the Johns Hopkins Bloomberg School of Public Health. If in previous instances it induced only mild disease, “it may not have registered a large enough number of cases to get on the public health radar screen.”
Ebola and HIV both turned out to have existed for many years before scientists recognized the diseases those viruses cause. Scientists discovered that by running antibody tests on blood that had been stored long ago.
An antibody test is sorely needed, in order to tease out an answer to that question. It would also help us to learn whether there are a great many mild or even symptomless cases that have gone unrecognized, which would change our perception of the lethality of the virus.
There are two main issues with COVID-19, and we don’t know all that much about either yet: contagiousness and lethality. But the situation of the Diamond Princess cruise passengers offers an opportunity to learn about both under a sort of worst case scenario, which is confinement of healthy with ill passengers in a closed system, and an especially susceptible population because of a high percentage of people of advanced age. So let’s take a look.
The first thing you’ll notice is that the headline blares that the ship started with 10 passengers testing positive for the virus and ended with 700 testing positive within the two weeks of the quarantine. That’s quite a leap. The total number of people on the ship was 3,711. So the final number testing positive represented about 19% of the whole, or a little less than a fifth. Of that number – in the month since the first person from the ship was diagnosed – 6 have died, which is .16% of the whole, and .86% of those who tested positive. Both figures are under 1%. That only represents a months’ time, of course, two weeks of which involved quarantine on the ship. But it’s a fairly low figure, especially considering the advanced ages of so many of the passengers. Time will tell whether there will be any more deaths of people who were on that ship.
A large part of the linked article is about the terrible conditions of confinement and fear on the cruise, and how certain things probably fostered the spread of the disease. It’s missing a clear timeline of when people were tested and whether some of the rise in cases over time represented the fact that only certain people were tested at first (perhaps only the symptomatic?). It’s really unclear from the article, and perhaps the health officials on the ship were the ones who were unclear in communicating exactly how the testing went.
This part is especially interesting:
More than half of the infected people (322) showed no symptoms at all, which suggests that some coronavirus carriers in China could be going undetected.
That’s a fact that indicates less mortality – and even less morbidity – than has commonly been reported.
This article also describes the people who died. The first two were 87 and 84, both with underlying pre–existing health issues. The next two were also people in their 80s, and it’s unclear what their previous health status had been. The fifth person was in her 70s, and the sixth was of as-yet unreported age. This is further indication that advanced age is a big factor, just as it is in pneumonia deaths and deaths from most varieties of flu (although not the 1918 flu, where the majority of deaths were of younger adults ).
One question as yet unanswered is, if you eliminate the asymptomatic passengers, what percentage of the others testing positive had only mild symptoms. But we don’t know; at least I haven’t seen this reported, even though it would be important information. This article, based not on the ship data but on Chinese health officials’ reports, says that 80.9% of cases in China have been mild. However, that probably misses almost all the cases that are asymptomatic, and so it doesn’t tell us much about that phenomenon. Of the 19% of confirmed cases in China that have been considered serious, 2.3% were critical, and all the deaths were in that group.
This is how the death rates for COVID-19 so far (mostly in China) compare to previous novel illnesses that have gotten a lot of publicity:
Overall, however, the COVID-19 fatality rate is far lower than that of past coronavirus epidemics. Based on the ratio of deaths to confirmed cases so far, it appears to be about 2%. Severe acute respiratory syndrome (SARS), by contrast, killed 9.6% of those infected, and Middle East respiratory syndrome (MERS) killed 34.4% of cases.
But on the other hand, those illnesses were seemingly less contagious and therefore more easily contained
The following is encouraging, and it makes sense to me:
Fauci and other experts, however, think the existing fatality rate will drop as more mild cases are counted.
And this article points out something that might be obvious but that’s still important to note: novel threats, even if they’re less dangerous than pre-existing threats, can cause more fear. People are used to the familiar.
As I mentioned in Part I, COVID-19 has been hyped by the press and the Democrats, the better to get clicks and/or sell papers, and to criticize and blame Trump. But there’s another factor, which is the increase in our economic dependence on products and shipments from China. That’s real, and any disruption in the supply chain from China could be very problematic. Ironically for the left, another thing Trump’s been doing for quite a while is trying to lessen our trade connection to China. But don’t sit on a hot stove waiting for the left to praise him for it.

