Johns Hopkins Center for Health Security engagement report
@BSPH_CHS - 686K followers on X
Measured over 7 original posts from a 30-day window, last computed on October 3, 2026.
Engagement
Early reading. We have captured 7 original posts for this account, below the 8 we require before treating a median as settled. The numbers above describe what we have seen so far, not a finished profile of the account.
A typical post picks up 7 interactions against 686K followers, an engagement rate of 0.001%. Posts are seen about 4.4K times each, and 0.16% of those impressions turn into an interaction. That is about 0.64% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.3 posts a day over the last 30 days, though only 27% of days saw any activity at all. Most posts go out around 13:00 UTC, and Monday is the busiest day of the week. Of the 7 posts sampled, 43% carry an image or video and 100% link out. The account's strongest tracked post pulled 741 interactions, about 106x its own typical post. Recurring topics include #nationalpreparednessmonth, #biosecurity, #elbi. Only 7 original posts have been captured so far, fewer than the 8 posts we want behind a median before treating it as settled. Read the figures above as an early measurement of this account, not as a finished profile of it.
Measured over 7 original posts from a 30-day window, last computed on October 3, 2026. Recurring tags: #nationalpreparednessmonth, #biosecurity, #elbi.
Where this sits in the catalog
At 0.001%, Johns Hopkins Center for Health Security sits below the 10th percentile of the 202,259 accounts in this comparison. That places it in the bottom 25% band, which runs below 0.024%.
Show the percentile table
| Percentile | Engagement rate |
|---|---|
| 10th percentile | 0.004% |
| 25th percentile | 0.024% |
| 50th percentile | 0.142% |
| 75th percentile | 0.672% |
| 90th percentile | 2.54% |
| 99th percentile | 82.5% |
This ruler is the whole measured catalog, not a size-matched group: it shows where the raw rate falls across every account we can measure, all of which are large. For a like-for-like comparison, read the size-band percentile above instead. See how the bands are built
Posting timing
This account posts most often around 13:00 UTC, and Monday is its busiest day of the week. The bars below are the catalog-wide pattern, with this account's own busiest slot marked. They do not show how this account performs at each hour: we keep one aggregate per account, not one per hour, so that measurement does not exist in our data.
Show engagement by hour posted, utc as a table
| Hour (UTC) | Vs author median | Posts |
|---|---|---|
| 00:00 UTC | -1% | 89K |
| 01:00 UTC | -2% | 90K |
| 02:00 UTC | -3% | 88K |
| 03:00 UTC | -4% | 94K |
| 04:00 UTC | -5% | 76K |
| 05:00 UTC | -4% | 75K |
| 06:00 UTC | -5% | 86K |
| 07:00 UTC | -5% | 93K |
| 08:00 UTC | -4% | 108K |
| 09:00 UTC | -4% | 124K |
| 10:00 UTC | -3% | 129K |
| 11:00 UTC | -3% | 141K |
| 12:00 UTC | -3% | 154K |
| 13:00 UTC | -3% | 167K |
| 14:00 UTC | -4% | 173K |
| 15:00 UTC | -2% | 176K |
| 16:00 UTC | -3% | 171K |
| 17:00 UTC | -3% | 159K |
| 18:00 UTC | -2% | 149K |
| 19:00 UTC | -2% | 141K |
| 20:00 UTC | -1% | 131K |
| 21:00 UTC | 0% | 116K |
| 22:00 UTC | -2% | 100K |
| 23:00 UTC | -1% | 90K |
Show engagement by day of week as a table
| Day | Vs author median | Posts |
|---|---|---|
| Sunday | +5% | 393K |
| Monday | +1% | 483K |
| Tuesday | -2% | 520K |
| Wednesday | -3% | 472K |
| Thursday | -2% | 430K |
| Friday | -3% | 447K |
| Saturday | +2% | 393K |
Formats this account uses
Its own posting mix on the left, and what each of those formats does across every account we track on the right. Only formats where the effect clears our publish test appear here, so an empty row is a format we could not measure rather than one that does nothing.
| Format | This account | Catalog effect | 95% interval | Accounts behind it |
|---|---|---|---|---|
| Image or video | 43% of posts | +111% | +108% to +115% | 34K |
| Outbound link | 100% of posts | -41% | -42% to -40% | 32K |
| Typical length | - | no effect | -2% to -1% | 42K |
- 43% of this account's sampled posts carry an image or video. Across the catalog, posts with an image or video run 111% above the same accounts' other posts.
- 100% of its posts carry a link off X. Across the catalog, posts with an outbound link run 41% below the same accounts' other posts, so a large share of this account's output sits in the weakest bucket we measure.
- Its average post runs 234 characters, which falls in the 180 - 280 characters band. Across the catalog, posts of 180 to 280 characters match the same accounts' other posts almost exactly.
These are catalog-wide differences applied to this account's own posting mix, not a measurement of how each format performs for this account specifically. We keep one median per account, not one per format per account, so the second thing is not something this data can tell you.
Best tweets
- Jun 4, 2026106x their median
No one should be able to order a bioweapon through the mail. @IFP & @JoinFAI are proud to co-lead an open letter calling for mandatory DNA synthesis screening & recordkeeping. Signatories include: - Sam Altman, CEO & Co-Founder, OpenAI - Dario Amodei, CEO & Co-Founder, Anthropic - David Baker, Director, Institute for Protein Design; 2024 Nobel Prize in Chemistry recipient - Patrick Collison, CEO & Co-Founder, Stripe - Paul Graham, Founder, Y Combinator - Demis Hassabis, CEO, Google DeepMind; 2024 Nobel Prize in Chemistry recipient - Emily Leproust, CEO & Co-Founder, Twist Bioscience - Lawrence Lessig, Roy L. Furman Professor of Law and Leadership, Harvard Law School - Gerald W. Parker, former Special Assistant to the President for Biosecurity and Pandemic Response - Mustafa Suleyman, CEO, Microsoft AI - Alex Tabarrok, Professor of Economics, George Mason University - Alexandr Wang, Chief AI Officer, Meta; Founder, Scale AI - Christine E. Wormuth, President & CEO, Nuclear Threat Initiative; 25th Secretary of the Army Read the letter and see the full list of signatories: https://t.co/BwZiJXw3JT Many DNA synthesis companies voluntarily screen orders to mitigate biosecurity risks, but no law requires them to do so. Leaders in AI, biotech, life sciences, national security, and the nucleic acid synthesis industry agree that Congress should act to strengthen safeguards against biological threats. @deanwball put it well in the WSJ: “If you’re synthesizing the stuff that yields biological life and viruses, we’re asking you to screen to see whether it is dangerous in some way. That seems like a reasonable thing for society to insist upon.”
- Jul 23, 202621x their median
#ICYMI Watch now to learn more about the SPEAR Repository and the latest “Tip of the SPEAR” resource. The webinar covers how to access preparedness tools, upcoming plans, and ways to engage with the SPEAR community. ▶️ https://t.co/rvv0SlPcRa
- Aug 3, 202613x their median
Last week, the Center’s Emerging Leaders in Biosecurity (#ELBI) Fellowship convened for its Research Symposium. The collaboration and innovation sparked by this meeting will enable us to address some of the most difficult #biosecurity challenges. https://t.co/vm2KfDTOiy https://t.co/76wUlC45fU
- Aug 14, 20268.0x their median
🚨 Training opportunity 🚨 We are now accepting applications for our #ELBI Fellowship Class of 2027. Don't miss your chance to join this prestigious network and contribute to the future of global #healthsecurity. Apply by September 30th: https://t.co/5jebX7fhAi
- Aug 12, 20266.3x their median
Curious about the future of #biosecurity? Look no further than our Emerging Leaders in Biosecurity (#ELBI) Fellowship, where the next generation gathers. Join our community to shape the future of #healthsecurity. Find out more about our 2027 application cycle, which opens August 14, 2026: https://t.co/jpg5R82Y9E
- Jun 18, 20265.7x their median
📢 Register now for a course on “Leading in a Public Health Emergency,” Nov 3-5 @JHUBloombergCtr. Leading this course are former CDC Director @RWalensky, former HHS Assistant Secretary for Preparedness and Response Dawn O’Connell, and Senior Scholars @C_R_Watson & @skirkell. Register for the course here: https://t.co/xTRJlsIr8h
- Apr 1, 20265.1x their median
🇩🇪 is pleased to co-finance the #GPWMD Counter CBRN Disinformation Initiative with €300,000. Building resilience to disinfo narratives + tactics used by certain states to discredit international co-operation, exposing false claims + naming those responsible is key. #CWC #BTWC https://t.co/Sf4dX56qUX
- Mar 10, 20264.7x their median
Last week, the Center’s Emerging Leaders in Biosecurity (#ELBI) Fellowship met in DC for the first time this year. These talented Fellows will deepen their expertise, expand their network, and build their leadership skills through a series of events coordinated by our Center. https://t.co/FiEjiYDuMD
- May 13, 20264.6x their median
📢Interested in contributing to the SPEAR repository? Visit the SPEAR website and explore our submission guide to discover how to share your materials with the SPEAR repository and become a vital part of our community!
- Oct 15, 2025
At the 2025 #ELBI Fall Workshop, fellows had the chance to connect with colleagues in Geneva. This closing event brought together the #biosecurity community, and we look forward to working with this group of leaders! Learn more: https://t.co/vm2KfDTOiy https://t.co/lDuhFGPAxK
Ranked by total interactions across everything we have tracked for this account, which is a longer history than the 30-day window the rates above use. The multiple compares each post to this account's own median.
Recurring topics
The most frequent hashtags in the sampled posts. They describe what this account writes about; they are not a performance signal, and the catalog-wide breakdown on the hub shows how little hashtag count moves.
Buy or sell Twitter (X) accounts - escrow-protected
PlayerSells is an escrow marketplace for Twitter (X) accounts. Every deal is protected, with no middleman risk.
Reading these numbers
A typical post picks up 7 interactions against 686K followers, an engagement rate of 0.001%. Posts are seen about 4.4K times each, and 0.16% of those impressions turn into an interaction. That is about 0.64% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.3 posts a day over the last 30 days, though only 27% of days saw any activity at all. Most posts go out around 13:00 UTC, and Monday is the busiest day of the week. Of the 7 posts sampled, 43% carry an image or video and 100% link out. The account's strongest tracked post pulled 741 interactions, about 106x its own typical post. Recurring topics include #nationalpreparednessmonth, #biosecurity, #elbi. Only 7 original posts have been captured so far, fewer than the 8 posts we want behind a median before treating it as settled. Read the figures above as an early measurement of this account, not as a finished profile of it.
- What is Johns Hopkins Center for Health Security's engagement rate on X?
- Johns Hopkins Center for Health Security (@BSPH_CHS) has an engagement rate of 0.001%, based on the median interactions across 7 original posts from the last 30 days against 685,645 followers. Replies, reposts and quote-posts of other people are excluded from that sample.
- Is that a good engagement rate?
- At 0.001%, Johns Hopkins Center for Health Security sits below the 10th percentile of the 202,259 accounts in this comparison. Those comparison accounts are all large ones, because our scanning cadence is weighted towards big accounts, so this is a ranking among peers of similar scale rather than a ranking across X.
- Does @BSPH_CHS have real engagement?
- There is not yet enough sample to rank this account against others of its size.
- When does @BSPH_CHS post?
- Most posts go out around 13:00 UTC, and Monday is its busiest day, at roughly 0.3 posts per day across the measured window.