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Brandon Dionne

@bwdionne

Associate Clinical Professor at Northeastern University School of Pharmacy and Pharmaceutical Sciences Infectious Diseases Clinical Pharmacist at Brigham and Women's Hospital. He/him.

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Latest posts by Brandon Dionne @bwdionne

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Do piperacillin/tazobactam and other antibiotics with inhibitory activity against Clostridium difficile reduce the risk for acquisition of C. difficile colonization? - PubMed Our findings suggest that piperacillin/tazobactam achieves sufficient concentrations in the intestinal tract to inhibit C. difficile colonization during therapy.

I suppose if you're wiping out most of the gut flora, better to go all the way than to spare anaerobes. It is a little odd, though. Among agents with activity against C.diff, only pip/tazo was associated with a lower risk of colonization (caveat of small n). pubmed.ncbi.nlm.nih.gov/27091232/

11.03.2026 00:53 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Pip/tazo has some activity against C.diff and may prevent sporulation while cefepime does not. pmc.ncbi.nlm.nih.gov/articles/PMC...

10.03.2026 22:37 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Ceftriaxone is not a strong inducer, though. This is the concern with bacteria with inducible ampC; the mechanism that allows inducibility can result in a resistant subpopulation with mutations that cause "stably derepressed" AmpC production that is hidden by the larger susceptible population.

24.11.2025 20:42 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Yes, they mention that in the recently published scientific statement from the AHA that you referenced.

16.09.2025 20:20 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

This is true, but do you know what the more common cause is?

15.09.2025 20:45 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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I applaud workers at the CDC for standing up against Sec. Kennedy’s dangerous anti-vaccine crusade.

We are witnessing a full-blown war on public health from the Trump Administration.

History will not look kindly on those who stayed silent in the face of this assault on science.

28.08.2025 22:34 πŸ‘ 2759 πŸ” 580 πŸ’¬ 61 πŸ“Œ 10
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Federal HIV Guidelines Face a Shutdown β€” A Critical Loss for Clinicians and Patients Each week, our HIV clinical group gathers to review active patients, share updates, and celebrate good news. On our whiteboard, we list four columns: Inpatients, Outpatients, Issues, andΒ Celebrations....

The federal HIV guidelines face a shutdown.
A trusted, living resource -- used by clinicians, programs, and public health agencies for decades -- may disappear due to β€œbudget decreases and revised priorities.”
Big mistake. #IDSky blogs.jwatch.org/hiv-id-obser...

20.06.2025 18:23 πŸ‘ 84 πŸ” 41 πŸ’¬ 11 πŸ“Œ 10

Happy ID pharmacist's Day! Thanks for joining us for our chat today to celebrate and spread the word about ID pharmacists. Don't forget to tag us and follow your fellow ID pharmacists :)

Q1. Please introduce yourself and tell us why you love being an ID pharmacist!

22.05.2025 16:05 πŸ‘ 19 πŸ” 10 πŸ’¬ 4 πŸ“Œ 2
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An Evidence-Based Approach to Covid-19 Vaccination | NEJM This article from the FDA compares broad U.S. recommendations on Covid vaccination with those from other countries and announces the adoption of an evidence-based approach to such recommendations.

Makary and Prasad have a sounding board piece written in NEJM about the future of COVID-19 vaccine regulation at the FDA.

Some thoughts:

20.05.2025 16:17 πŸ‘ 171 πŸ” 78 πŸ’¬ 17 πŸ“Œ 33
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I'm proud to share that I was recognized as a Fellow of the Infectious Diseases Society of America! @idsainfo.bsky.social

20.05.2025 14:23 πŸ‘ 21 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Screenshot of IDSA cUTI guideline open for public comment

Screenshot of IDSA cUTI guideline open for public comment

Draft of IDSA cUTI guideline showing steps to follow for selection of therapy

Draft of IDSA cUTI guideline showing steps to follow for selection of therapy

Figure 2 flowchart showing stepwise assessment of IV to PO switch and duration of therapy

Figure 2 flowchart showing stepwise assessment of IV to PO switch and duration of therapy

Figure showing old vs new definition of uUTI, cUTi, and acute pyelonephritis

Figure showing old vs new definition of uUTI, cUTi, and acute pyelonephritis

‼️The @idsainfo.bsky.social cUTI guideline πŸ“„ draft is now available for public commentπŸ—£οΈ! This version has been reviewed by 15+ orgs & revised according to extensive feedback provided to us. www.idsociety.org/practice-gui...

UTIsky IDsky Medsky PharmSky

20.02.2025 00:18 πŸ‘ 45 πŸ” 22 πŸ’¬ 5 πŸ“Œ 2

WHERE WAS THIS 6 MONTHS AGO WHEN I WAS RESEARCHING OUR TETRACYCLINES EPISODE??!!

Wotevs. Check out this awesome review

Unless u r driving or hate reading; then our episode is here: podcasts.apple.com/gb/podcast/i...

And the episode on the newer agents here: podcasts.apple.com/gb/podcast/i...

14.01.2025 18:29 πŸ‘ 15 πŸ” 5 πŸ’¬ 2 πŸ“Œ 0
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Tetracyclines, the Old and the New: a Narrative Review Tetracyclines have remained a cornerstone of antimicrobial therapy for over seven decades, demonstrating broad-spectrum activity against a wide range …

Tetracyclines always been a fascinating antibiotic class. So many different evolutions, and antimicrobial activity that variably spans across Gram pos & neg bacteria, as well as malaria!

Cool review in @cmicomms.bsky.social by @jeffpears0n.bsky.social @bwdionne.bsky.social

#IDSky #clinmicro #AMR

14.01.2025 12:23 πŸ‘ 41 πŸ” 12 πŸ’¬ 0 πŸ“Œ 9