Coronavirus spreads quickly and sometimes before people have symptoms, study finds – Science Daily

Infectious disease researchers at The University of Texas at Austin studying the novel coronavirus were able to identify how quickly the virus can spread, a factor that may help public health officials in their efforts at containment. They found that time between cases in a chain of transmission is less than a week and that more than 10% of patients are infected by somebody who has the virus but does not yet have symptoms.

In the paper in press with the journal Emerging Infectious Diseases, a team of scientists from the United States, France, China and Hong Kong were able to calculate what’s called the serial interval of the virus. To measure serial interval, scientists look at the time it takes for symptoms to appear in two people with the virus: the person who infects another, and the infected second person.

Researchers found that the average serial interval for the novel coronavirus in China was approximately four days. This also is among the first studies to estimate the rate of asymptomatic transmission.

The speed of an epidemic depends on two things — how many people each case infects and how long it takes for infection between people to spread. The first quantity is called the reproduction number; the second is the serial interval. The short serial interval of COVID-19 means emerging outbreaks will grow quickly and could be difficult to stop, the researchers said.

“Ebola, with a serial interval of several weeks, is much easier to contain than influenza, with a serial interval of only a few days. Public health responders to Ebola outbreaks have much more time to identify and isolate cases before they infect others,” said Lauren Ancel Meyers, a professor of integrative biology at UT Austin. “The data suggest that this coronavirus may spread like the flu. That means we need to move quickly and aggressively to curb the emerging threat.”

Meyers and her team examined more than 450 infection case reports from 93 cities in China and found the strongest evidence yet that people without symptoms must be transmitting the virus, known as pre-symptomatic transmission. According to the paper, more than 1 in 10 infections were from people who had the virus but did not yet feel sick.

Previously, researchers had some uncertainty about asymptomatic transmission with the coronavirus. This new evidence could provide guidance to public health officials on how to contain the spread of the disease.

“This provides evidence that extensive control measures including isolation, quarantine, school closures, travel restrictions and cancellation of mass gatherings may be warranted,” Meyers said. “Asymptomatic transmission definitely makes containment more difficult.”

Meyers pointed out that with hundreds of new cases emerging around the world every day, the data may offer a different picture over time. Infection case reports are based on people’s memories of where they went and whom they had contact with. If health officials move quickly to isolate patients, that may also skew the data.

“Our findings are corroborated by instances of silent transmission and rising case counts in hundreds of cities worldwide,” Meyers said. “This tells us that COVID-19 outbreaks can be elusive and require extreme measures.”

Zhanwei Du of The University of Texas at Austin, Lin Wang of the Institut Pasteur in Paris, Xiaoke Xu of Dalian Minzu University, Ye Wu of Beijing Normal University and Benjamin J. Cowling of Hong Kong University also contributed to the research. Lauren Ancel Meyers holds the Denton A. Cooley Centennial Professorship in Zoology at The University of Texas at Austin.

The research was funded by the U.S. National Institutes of Health and the National Natural Science Foundation of China.

Story Source:

Materials provided by The University of Texas at Austin. Note: Content may be edited for style and length.

494 Replies to “Coronavirus spreads quickly and sometimes before people have symptoms, study finds – Science Daily”

  1. ISM Phototake 3) Watney Ninth Phototake, Canada online dispensary Phototake, Biophoto Siblings Adjunct Therapy, Inc, Directed Rheumatoid Lupus LLC 4) Bennett Hundred Calaboose Situations, Inc 5) Ephemeral Atrial Activation LLC 6) Stockbyte 7) Bubonic Resection Grade LLC 8) Indefatigability With and May Go for WebMD 9) Gallop WebbWebMD 10) Velocity Resorption It LLC 11) Katie Appeaser and May Bring forward instead of WebMD 12) Phototake 13) MedioimagesPhotodisc 14) Sequestrum 15) Dr. https://www.ecosia.org/search?q=tadaok.com Mqigmw hcxdnv

  2. Pingback: viagra price
  3. Pingback: otc viagra
  4. Pingback: generic for viagra
  5. Pingback: buy viagra
  6. Pingback: sildenafil
  7. Does your site have a contact page? I’m having trouble locating it but, I’d like to shoot you an e-mail. I’ve got some creative ideas for your blog you might be interested in hearing. Either way, great website and I look forward to seeing it develop over time.

  8. Its such as you learn my mind! You appear to know so much approximately this, like you wrote the e book in it or something. I think that you simply could do with a few p.c. to force the message home a little bit, however other than that, that is magnificent blog. A fantastic read. I’ll certainly be back.

  9. Pingback: when to buy viagra
  10. Pingback: buy genuine viagra
  11. Pingback: cialistodo.com
  12. My programmer is trying to convince me to move to .net from PHP. I have always disliked the idea because of the expenses. But he’s tryiong none the less. I’ve been using WordPress on various websites for about a year and am concerned about switching to another platform. I have heard very good things about blogengine.net. Is there a way I can transfer all my wordpress posts into it? Any help would be really appreciated!

  13. Pingback: viagra for sale
  14. Does your site have a contact page? I’m having trouble locating it but, I’d like to shoot you an email. I’ve got some suggestions for your blog you might be interested in hearing. Either way, great website and I look forward to seeing it expand over time.

  15. Pingback: cialis coupon
  16. Pingback: buy viagra online
  17. What i don’t realize is in fact how you’re not actually much more well-favored than you might be right now.
    You’re very intelligent. You recognize therefore significantly with regards
    to this subject, produced me individually consider it from so many numerous angles.

    Its like women and men aren’t fascinated except it’s something to do with Girl gaga!
    Your own stuffs outstanding. Always take care of it up! https://www.wisig.org/

  18. Pingback: tadalafil
  19. Pingback: viagra price
  20. Pingback: rxtrustpharm
  21. Hello, i think that i saw you visited my web site thus i came to “return the favor”.I am trying to find things to enhance my site!I suppose its ok to use some of your ideas!!

  22. Terrific article! That is the kind of info that are supposed to be shared across the web. Disgrace on Google for not positioning this put up higher! Come on over and consult with my site . Thanks =)

  23. It’s perfect time to make some plans for the long run and it is time to be happy. I’ve read this submit and if I could I wish to recommend you few fascinating things or suggestions. Perhaps you can write next articles relating to this article. I desire to read even more issues about it!

  24. Pingback: rxtrust pharm
  25. Pingback: aricept 5mg prices
  26. Pingback: cialis price
  27. Hey! Someone in my Facebook group shared this site with us so I came to give it a look. I’m definitely enjoying the information. I’m bookmarking and will be tweeting this to my followers! Excellent blog and terrific design.

  28. Pingback: canadian viagra
  29. Pingback: ceftin tablet
  30. Pingback: celebrex price
  31. Pingback: celexa cheap
  32. Pingback: cephalexin online
  33. Pingback: online casinos usa
  34. Pingback: gambling games
  35. Pingback: hollywood casino
  36. Pingback: free slots
  37. Pingback: casino games