I'm betting we've been seeded since even before Wuhan's quarantine started. My folks and I all got pretty thoroughly sick during a cruise in early January, and they're becoming increasingly convinced it was COVID (especially since my stepmom tested negative for any sort of flu, and this was well before there were reports of COVID outside of China so of course the doctors wouldn't think to test for it even if they happened to have a test kit); it's increasingly difficult for me to be skeptical of that conclusion.
Thankfully all of us seemed to get over it without much complication, and it doesn't seem like very many of the people we've since interacted with have come down with it. We might very well have just been lucky, though.
It seems very likely that many people (especially in areas with lots of travel to/from China) who had "a bad flu" followed by a chest infection in January or early February actually had COVID.
We are unlikely to ever find out, because we won't have a reason to give everyone antibody tests
Small sample size but: similar experience here (in the middle of the USA). One of my son's friend's mother was even hospitalized for "pneumonia" for a few days. This was the first time I heard of a fairly young fit person having pneumonia due to the flu.
A couple of people I know at work (in Canada) had pneumonia in December (I think). Sometimes pneumonia is pneumonia. I assume even more had it and I just don't know.
Neither of them had traveled anywhere recently.
I dunno, where was your cruise and were there lots of mainland Chinese people on it? Sadly the symptoms for CoVid-19 are pretty common across a variety of diseases, so “flu-like but not flu” doesn’t necessarily point to this. At that time during the outbreak, it seems likely you would have needed to have people from Wuhan on-board.
Los Angeles → Catalina Islands → Ensenada → Los Angeles
> and were there lots of mainland Chinese people on it?
I mean, I didn't exactly go around asking people "are you from China?", but based on the number of people who sounded like they were speaking Mandarin I'd tentatively answer "yes".
> Sadly the symptoms for CoVid-19 are pretty common across a variety of diseases, so “flu-like but not flu” doesn’t necessarily point to this.
Indeed, which is why I'm still at least somewhat skeptical. Still, it's hard to rule it out, especially given the relatively-severe symptoms (not the absolute worst I've felt, but it was pretty bad).
Lots of people live in LA who haven't been to China in decades speak Chinese as a first language. The relevant question is whether there were many people on that cruise directly visiting directly from Wuhan/Hubei. LA-catalina-ensenada-LA? Doubt it. Not exactly the type of cruise someone flies thousands of miles for.
True. Like I said, it ain't like I was going around asking people if they're from Wuhan, lol
That said, you'd be surprised what draws tourists from mainland China; Las Vegas and Reno (for example) both get plenty of Chinese tourists looking specifically to gamble, and I'd imagine the ship's onboard casino to have a similar appeal. Plus, there were plenty of other tourists from long distances, too, both from within the US (East Coast) and from Europe and Australia (from what I gathered from the people whom I did talk to). So evidently there were at least some non-Chinese tourists flying thousands of miles for it; seems reasonable that some mainland Chinese tourists might, too.
That's a really good dataset (with a really clunky visualization, but hey!)
Indeed. There are typically above 3000 deaths/week due to Pneumonia and 200/week due to influenza at this time of year. We had a smallish spike in mid-late January, where for 3 consecutive weeks, deaths were above trend at nearly 4000 & 400 per week.
If you assume a 1% mortality rate for COVID, and you assume all deaths are due to pneumonia, and you assume the entire late-January spike is due to COVID, that could be hiding 300,000-400,000 US cases. (To be clear, those are all questionable assumptions! The mortality rate could easily be either lower or higher, a meaningful fraction of deaths might not show as pneumonia or influenza, and it is normal for there to be a moderate spike above trend at some point in the flu season)
That doesn't mean that there were or weren't a few hundred thousand cases in that time -- it just means that some significant number of cases could easily hide in "routine-looking" spikes in the graph.
This does mean, though, that it is unlikely that everybody who got "the really bad flu" that's been going around this year actually had COVID -- but, especially if you live in a place with lots of people who travel to China regularly (like I do!), it isn't unreasonable to wonder if that "really bad flu followed by a lower-respiratory-tract infection that tested negative for influenza" you got in late January/early February wasn't really COVID.
(Remember, though, that while the rapid influenza test has a pretty low false-positive rate, it's got about a 50% false negative rate -- so testing negative shouldn't lead you to assume it isn't influenza)
If you are in ICU with flu symptoms, they don't just shrug when the rapid influenza test comes back negative. There are reflex tests that can be run to confirm positive or negative.
Critical cases and fatal cases are way more likely to be detected for this reason -- but during the 3 weeks I was talking about, it was believed that there was no COVID in the US, except for folks evacuated from China to quarantine sites.
During that time unexplained pneumonia leading to death -- especially in an older individual -- would likely not have been thought to be COVID, and would just have gone on the books as pneumonia.
14% of cases result in severe pneumonia. R0 is about 4. Average incubation time 6 days. Average time to death/severe illness from onset of symptoms 16 days. If your folks and you got COVID before the Wuhan quarantine you would know someone, likely several people, personally who is/are in the hospital right now with severe respiratory distress.
Thankfully all of us seemed to get over it without much complication, and it doesn't seem like very many of the people we've since interacted with have come down with it. We might very well have just been lucky, though.