Petra Klepac

@petrakle

Assistant Professor of Infectious Disease Modelling at LSHTM. Former and fellow.

petraklepac.com
Joined March 2009
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  1. Pinned Tweet
    Feb 19

    Remember the fantastic massive citizen science project behind the Pandemic project presented by ? We are releasing social contact matrices from contact data collected. With & Prof Julia Gog

    3 replies 54 retweets 112 likes
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  2. May 22

    A great database of clusters of COVID-19 transmission that gets regularly updated

    Our updated database of COVID-19 transmission settings: This week lots more household, meal & religious clusters were added. Also a few more school outbreaks & meat processing plants. Why meat processing and not other types of food?
    2 retweets 6 likes
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  3. May 22

    An excellent overview of clustering of disease transmission and its importance for COVID19 dynamics and control. Featuring work from and input from and others:

    2 replies 50 retweets 76 likes
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  4. Retweeted
    May 17

    Korean study on SARS-CoV-2 transmission in fitness & dance classes at 12 sports facilities. Infection in high intensity fitness classes. No infection in yoga and pilates classes. Risk factors: ⬆️class size,🤏🏽space, ⬆️ intensity workouts, moisture.

    36 replies 873 retweets 1,456 likes
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  5. Retweeted
    May 14

    Thanks to the kind help of at , our time-varying R website has been updated: We now scale cases back from confirmation to infection date to estimate Rt, which has caused issues for Palestine + Iceland

    1 reply 3 retweets 8 likes
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  6. Retweeted
    May 17

    “No human being who has ever lived has saved more lives in history than the simple country doctor from Gloucestershire.” () in 1749 Edward Jenner, the pioneer of vaccination, was born in Berkeley. (1/4)

    , , and 6 others
    7 replies 215 retweets 462 likes
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  7. Retweeted
    May 17
    Replying to

    🥳 Amongst eating lots of cake we’ve also posted this thread for Jenner’s birthday, would you mind sharing please?

    “No human being who has ever lived has saved more lives in history than the simple country doctor from Gloucestershire.” () in 1749 Edward Jenner, the pioneer of vaccination, was born in Berkeley. (1/4)
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    1 retweet 2 likes
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  8. May 17

    Happy birthday to Edward Jenner! On May 14th 1796 Jenner inoculated 8yo James Phipps with fluid from a cowpox blister and then developed immunity to smallpox. A vaccine for smallpox was born. On December 9th 1979 smallpox was confirmed to be eradicated globally.

    Born in 1749 was Edward Jenner FRS, physician & populariser of vaccination. Jenner noted that those exposed to cowpox were often immune smallpox, which was much more dangerous. He used this information to develop a method to vaccinate against smallpox.
    1 reply 7 retweets 18 likes
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  9. Retweeted
    May 15

    Brilliant! That’s so exciting to hear Alex! Having a Dried Blood Spot antibody tests to use in Postal or Outreach Kits will be a huge boost for studies of spread Great collab btwn &

    Today we have successfully trialled our dried blood spot system. Picked up mild community case of COVID. Promising for seroprevalence.
    13 retweets 37 likes
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  10. Retweeted
    May 14

    We've got another great talk for you TODAY at 3pm (UK time) as part of from Director on Models for watch live here

    , , and 2 others
    2 replies 26 retweets 27 likes
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  11. Retweeted
    May 13

    The is team of 50+ faculty, students, and informationists at and beyond sorting through thousands of preprints and publications for the highest quality work so you don't have to. Check us out at !

    72 retweets 127 likes
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  12. Retweeted
    May 12

    'You ask me why I do not write something... I think one’s feelings waste themselves in words; they ought all to be distilled into actions and into actions which bring results' -Florence Nightingale

    1:01
    Happy 200th birthday ! Nightingale was a founder of modern nursing & a pioneer statistician, using data from hospitals to illustrate the sources of patient mortality. Below you can see one of her diagrams, along with an 1890 recording.
    6 replies 64 retweets 162 likes
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  13. Retweeted
    May 11

    Johns Hopkins is offering a free online course "COVID-19 Contact Tracing" via . The 6-hour class from will cover the basics of and will be a requirement for New York hires.

    11 retweets 14 likes
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  14. May 11

    Heterogeneity can lead to herd immunity being achieved at a lower threshold than classical 1-1/R0 (). But if there is little variation in population's contact structure herd immunity threshold will be *higher* than 1-1/R0 ()

    2 retweets 3 likes
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  15. May 11

    Excellent thread by on the role of heterogeneity on community immunity.

    There has been much discussion recently about herd immunity, and the impact of heterogeneity on herd immunity. A thread. (1/)
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    1 reply 3 retweets 7 likes
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  16. Retweeted
    May 7

    Now peer reviewed and published today. Our work looking at the impact of lockdown on contacts and the reproduction number in the UK.

    New research from and colleagues: Quantifying the impact of physical distance measures on the transmission of in the Read it here:
    1 reply 32 retweets 92 likes
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  17. Retweeted
    May 8

    Our database of settings potentially linked to transmission clusters has been updated: The newly included identified settings are: meat processing plants, prisons & weddings. Further e.g.s of indoor settings with close contact&shared facilities.

    What settings have been linked to clusters of cases? Our new analysis, co-authored by the working group, is now available in (NB: not yet peer-reviewed) (1/5)
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    2 replies 49 retweets 75 likes
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  18. Retweeted
    May 11

    We analysed inter-prefecture human mobility in mainland China amid domestic travel restrictions RE: and discussed its public health/ implications. Joint work with Hamish Gibbs, , and wi . (1/5) NB: not yet peer-reviewed.

    , and
    1 reply 16 retweets 40 likes
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  19. Retweeted
    May 10

    This is a concerning trend in many countries in the context of . "Routine for U.S. children have plummeted during the Covid-19 pandemic" via

    11 replies 52 retweets 58 likes
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  20. Retweeted
    May 8

    8th May 1945 - VE-Day & 8th May 1980 Official Declaration of the eradication of smallpox. Peace and Health.

    5 replies 72 retweets 349 likes
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  21. Retweeted
    May 8

    Great to work with J. Lemaitre, J. Perez-Saez, A. Rinaldo in looking at COVID transmission in Switzerland and mobility. Complements serosurvey results from showing that tx reductions are mostly from behaviour change, not immunity.

    3 replies 90 retweets 159 likes
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