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Flu has disappeared worldwide during the Covid pandemic

scientificamerican.com

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Re: Flu has disappeared worldwide during the Covid pandemic

#301
I'd like to highlight this previous discussion on influenza: On the epidemiology of influenza (2008) [1]

In this paper, in 2008, researchers observe and conjecture a number of things that we now know also apply to SARS-Cov-2:

* The long-tailed distribution of R: Few infect many

* A low secondary attack (household infection) rate of 20-30%

* 'Asymptomatic' infection as opposed to sick-to-well infection

[1] https://news.ycombinator.com/item?id=26857283

Re: Flu has disappeared worldwide during the Covid pandemic

#302
post #94

Earlier quoted context omitted.

If you had flu symptoms, are you not going to go get a covid test?

I had Covid symptoms but didn’t bother getting a test because I thought it’s better to stay at home than go out and spread it around.

I have had a flu the last year twice, both times tested negative.

Re: Flu has disappeared worldwide during the Covid pandemic

#303
post #295
post #281

Earlier quoted context omitted.

My money is on schools being a more active vector than makes sense. And I don't see us closing them like we did on a regular basis.

It would be sensible to improve school air quality: increase ventilation, install air purifiers, etc That would reduce the spread of infectious diseases even with schools open as normal.

I mean. Yes. But kids also touch things far more than adults. Combined with less developed immune systems, I suspect there is a floor to how well you can reduce transmission. More, it is almost certainly related to this densely populated the school is. Which, not surprisingly, will hit poor schools harder.

Edit: furthering this idea, buses are not likely to keep the same protocols they have now.

Re: Flu has disappeared worldwide during the Covid pandemic

#304
post #271

This should not come as a surprise, and it was largely predictable from the outset. The flu has a base reproduction number (R0) less than 2 ( https://www.vdh.virginia.gov/coronavirus/2020/12/07/covid-19... ). Covid has an R0 in the vicinity of 2.5 ( https://www.cdc.gov/coronavirus/2019-ncov/hcp/planning-scena... ). In the meantime, public health measures like masking and distancing will work against both viruses. If…

> This should not come as a surprise, and it was largely predictable from the outset....the flu has a base reproduction number (R0) less than 2....Covid has an R0 in the vicinity of 2.5....In the meantime, public health measures like masking and distancing will work against both viruses....there's really no need for conspiracy theorizing. Assuming that this is due to "masking and distancing" and the small difference…

[deleted]

Re: Flu has disappeared worldwide during the Covid pandemic

#305
post #285

I was just commenting to a co-worker my entire family hasn't been sick since the pandemic started. That is very unusual for a family with young children. No flu, no stomach viruses, absolutely nothing for more than a year now. Thankfully no covid-19 either.

Stomach viruses. Where in the world are you? No, seriously - where? Because here in the United States people don't wash their hands before eating. It's fucking gross. I always sanitize my hands with alcohol pads before eating out - ALWAYS. But the others grab subway poles, handles, those nasty menus, and THEN they grab that sandwich with the same hands . If anything should come out of this pandemic, it should be Amer…

You do realize this is probably all in your head? Like the food you eat is probably full of bacteria, the plate you eat on, the fork you use?

Like you sit there with an attitude, but in the kitchen you cant see your food was cooked on an unclean grill

If it makes you feel superior or better, go ahead.

Re: Flu has disappeared worldwide during the Covid pandemic

#306

Earlier quoted context omitted.

I suspect a significant reduction of flu vectors is simply closed schools.

While I have two myself, I am the first to say it: Children are disease carrying vermin

In Germany meanwhile it has become a meme that "schools are not the driver off the pandemic" stated by all politicians who are obviously taking a page from the Iraqi information Ministers playbook.

Re: Flu has disappeared worldwide during the Covid pandemic

#307
post #283
post #271

Earlier quoted context omitted.

> This should not come as a surprise, and it was largely predictable from the outset....the flu has a base reproduction number (R0) less than 2....Covid has an R0 in the vicinity of 2.5....In the meantime, public health measures like masking and distancing will work against both viruses....there's really no need for conspiracy theorizing. Assuming that this is due to "masking and distancing" and the small difference…

Possible explanations include: - More asymptomatic transmission of rhinovirus/enterovirus and adenoviruses than influenza. People often don't notice these illnesses, so wouldn't assume it is COVID and quarantine like they would for influenza. - More fomite spread than influenza. They may be more stable on surfaces or in food

These are reasonable theories as well. Though the second one would really have to be "SARS-CoV2 has more fomite spread than flu" to explain the observations.

In general though, any sort of explanation that focuses on differences in transmission is more plausible than hand-wavy theories involving R0 and masks. People just desperately want to find evidence that the stuff we did this year made a huge difference.

Re: Flu has disappeared worldwide during the Covid pandemic

#308
post #271

This should not come as a surprise, and it was largely predictable from the outset. The flu has a base reproduction number (R0) less than 2 ( https://www.vdh.virginia.gov/coronavirus/2020/12/07/covid-19... ). Covid has an R0 in the vicinity of 2.5 ( https://www.cdc.gov/coronavirus/2019-ncov/hcp/planning-scena... ). In the meantime, public health measures like masking and distancing will work against both viruses. If…

> This should not come as a surprise, and it was largely predictable from the outset....the flu has a base reproduction number (R0) less than 2....Covid has an R0 in the vicinity of 2.5....In the meantime, public health measures like masking and distancing will work against both viruses....there's really no need for conspiracy theorizing. Assuming that this is due to "masking and distancing" and the small difference…

> and the small difference in R0 is crude thinking.

Given the reproduction number appears as the base of an exponent, I would not consider the difference "small."

If influenza has a typical R0 of about 2, reducing contacts by 50% would make its growth non-exponential. If covid has a typical R0 of about 2.5, doing the same would require a further 20% reduction of contacts, to 40% of baseline rather than 50%. Since population behaviour and legal restrictions have diminishing returns (eliminating casual contacts first at lower cost, then progressively higher-cost and more essential contacts), this could easily correspond to a large difference in effected (necessary) policy.

> Second, R0 is an estimated value. There are big error bars on all of these estimates -- the overlap is far greater than the 0.5 you're using to claim causality.

I have seen no credible evidence that typical (non-pandemic) influenza has an R0 greater than that of SARS-CoV-2. If you have a citation handy to the contrary, I'd be interested in seeing it. In the meantime, I tried to be generous in my estimation of influenza's R0; even your reference [2] places its central estimate at 1.68.

> Third, rhinovirus has not gone away (estimated R0 Rhinovirus and adenovirus both have mean-estimate R0 greater than that of influenza in your reference [2], so if policy is going to eliminate any of these disease from general circulation then influenza would be the first.

Furthermore, some analysis does show limited evidence of a reduction of rhinovirus cases (https://www.nature.com/articles/d41586-020-03519-3). A confounding factor here, however, is that we don't really have comprehensive like-against-like monitoring for rhinovirus in the way developed nations monitor for influenza. Adenoviruses as a broad category are also not limited to respiratory transmission, so air-focused restrictions would have less effect on these other routes.

Finally, I reiterate that flu has a pronounced seasonal variation, whereas rhinovirus is somewhat less variable. A set of social responses only needs to prevent the flu season from starting to make it "disappear."

Re: Flu has disappeared worldwide during the Covid pandemic

#309
post #285

I was just commenting to a co-worker my entire family hasn't been sick since the pandemic started. That is very unusual for a family with young children. No flu, no stomach viruses, absolutely nothing for more than a year now. Thankfully no covid-19 either.

Stomach viruses. Where in the world are you? No, seriously - where? Because here in the United States people don't wash their hands before eating. It's fucking gross. I always sanitize my hands with alcohol pads before eating out - ALWAYS. But the others grab subway poles, handles, those nasty menus, and THEN they grab that sandwich with the same hands . If anything should come out of this pandemic, it should be Amer…

I don't have data but my hunch is that being a germophobe leads to worse long term health outcomes. Your immune system needs the exercise.
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