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Mark Dexter

@pedsdocdex.bsky.social
43 followers 28 following 202 posts

Pediatric intensivist, lover of vaccines, pie-diatrician, currently in Boston.

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Mark Dexter @pedsdocdex.bsky.social · 08/10/2026
No, @npr.org, RFK Jr. has not been “raising questions” about vaccines for years. He’s a blatant anti-vax propagandist.
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Memento (spooky) Morty 🌙 @mementomorty.bsky.social · 30/09/2026
i had a family member request we give their dying loved one ivermectin to treat their cancer because chatgpt said it was a cure for both and it is not
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Mark Dexter @pedsdocdex.bsky.social · 30/09/2026
Raw milk sold by a chiropractor???? We’re just layering on the quackery!
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Mark Dexter @pedsdocdex.bsky.social · 18/09/2026
These people are not “skeptics” by any definition of the word and NYT headline editors should stop labeling them as such.
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Mark Dexter @pedsdocdex.bsky.social · 04/09/2026
Cowards.
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Mark Dexter @pedsdocdex.bsky.social · 10/08/2026
Stephen Miller still out here speedrunning the “worst Duke grad ever” race.
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Mark Dexter @pedsdocdex.bsky.social · 10/08/2026
The only epidemic is measles, which is spreading because people are foregoing vaccination. 🤦‍♂️
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Mark Dexter @pedsdocdex.bsky.social · 09/08/2026
Bhattacharya’s attacks are one of the main reasons people have lost faith in public health.
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Mark Dexter @pedsdocdex.bsky.social · 04/08/2026
Two doses of the MMR vaccine costs the government about fifty bucks. 🤦‍♂️ www.reuters.com/legal/litiga...
reuters.com
A single US measles outbreak can cost millions of dollars, study estimates
The overall cost of containing a 2025 measles outbreak in New Mexico was nearly $5.4 ‌million, a new study estimates.
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Memento (spooky) Morty 🌙 @mementomorty.bsky.social · 03/08/2026
these lunatics might be able to lie to a lot of people, but what they're forgetting is how many frontline workers lived the exact same experience across the entire world
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Mark Dexter @pedsdocdex.bsky.social · 03/08/2026
This man is a liar. Signed, A pediatric ICU doctor who was taking care of intubated adult COVID patients in a Boston PICU in 2020 because the adult ICUs were full.
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Mark Dexter @pedsdocdex.bsky.social · 29/07/2026
I see way too many professional org talks & grand rounds about “how do we regain trust in public health” and not nearly enough about who is actually destroying said trust.
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paulpro @mariopro.bsky.social · 29/07/2026
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Mark Dexter @pedsdocdex.bsky.social · 29/07/2026
Senators Johnson and Moreno are clowns from whom I don’t expect anything, but Rand Paul and Roger Marshall are fellow physicians and should be ashamed of how they’re attacking Fauci.
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Mark Dexter @pedsdocdex.bsky.social · 23/07/2026
Bill Cassidy should voluntarily surrender his medical license in shame.
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Ryan Marino, MD @ryanmarino.bsky.social · 23/07/2026
Idk maybe your opinion about children’s health should be worthless if you’d rather see a child die than accept neurodivergence
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Mark Dexter @pedsdocdex.bsky.social · 21/07/2026
We’re gonna have to make Ralph Northam the next ambassador to Italy. He’ll personally have the problem solved in two months. www.chesapeakebaymagazine.com/italy-puts-1...
chesapeakebaymagazine.com
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Meredith Shiner @meredithshiner.com · 16/07/2026
"Why isn't anyone else wearing a mask when the air is so bad?" was high heat from the kid born in SEPTEMBER TWENTY TWENTY
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Mark Dexter @pedsdocdex.bsky.social · 16/07/2026
Yes, allergies are important but if you’re microwaving fish in the break room we have way bigger issues to deal with.
A sticker above the countdown on a microwave where someone has written “Please Clean After Fish PATIENTS with allergies.” The timer shows 2 seconds left.
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Mark Dexter @pedsdocdex.bsky.social · 02/07/2026
My PICU fellowship was at the hospital that had NC’s burn center. I would have little twinges of panic every summer when I’d drive past the pop-up fireworks stand near my apartment.
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Mark Dexter @pedsdocdex.bsky.social · 13/06/2026
My new intro when teaching PALS:
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Nicholas Grossman @nicholasgrossman.bsky.social · 17/05/2026
The Physicians for Measles Caucus in the US Senate is losing its most prominent member, as Republican Bill Cassidy, MD and RFK Jr. confirmer, has lost the primary. Many Republican Senators have violated their oath of office. Bill Cassidy was one of the few to violate the Hippocratic oath as well.
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Mark Dexter @pedsdocdex.bsky.social · 17/05/2026
Bill Cassidy is a coward who got exactly what he deserved.
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Alejandra Caraballo @esqueer.net · 16/05/2026
Texas Children's caved and ended care under pressure in April 2022, over four years ago and they still got targeted by DOJ and Paxton. NYU caved and they still got served with a grand jury subpoena. Caving and abandoning will not save you. You have to fight these bastards or they will destroy you.
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Duaa Eldeib @deldeib.bsky.social · 06/05/2026
This was a hard story to report. Newborns who don’t get a vitamin K shot are 81 times more likely to develop a condition where they bleed uncontrollably. But more and more families are declining the shot. And babies are dying. www.propublica.org/article/more...
propublica.org
Babies Are Bleeding to Death as Parents Reject a Vitamin Shot Given at Birth
A lifesaving injection given at birth to prevent severe bleeding has become collateral damage of the anti-vaccine movement.
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Mark Dexter @pedsdocdex.bsky.social · 06/05/2026
Just absolute “WTF???” news. Especially from an admin that claims to want to “protect” children.
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Kristen Panthagani, MD, PhD @kmpanthagani.bsky.social · 01/05/2026
Did AI really beat ER doctors at ER triage? Nope. But with the headlines circulating this week around a new Science paper, you wouldn’t be blamed for walking away with that conclusion. Here’s what actually happened and why the headlines are wrong: www.youcanknowthings.com/did-ai-reall...
youcanknowthings.com
Did AI really beat ER doctors at ER triage?
Nope. A look at an interesting AI study that has led to some very overhyped headlines. Yesterday a new study was published in Science comparing the diagnostic capacity of several AI tools to physicia...
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Thomas [DARK MODE], DO @tom.medsky.social · 02/05/2026
Mary this is literally how vaccines are supposed to work.
A tweet from yesterday from Mary Talley Bowden. 

I’m seeing a pattern in my clinic that we can't ignore. Antibody levels in patients who received the shots are testing 10 times higher than those who didn't. Here is why that spike protein load matters.
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Mark Dexter @pedsdocdex.bsky.social · 01/05/2026
These goddamn idiots.
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Mark Dexter @pedsdocdex.bsky.social · 21/04/2026
Uhhhhhhhhhhhhhhhhh. 😳
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Me and a small nugget of love. 🇸🇪♥️🇺🇦 @mnotme.bsky.social · 19/04/2026
The human circulatory system, before and after proper cable management.
two images of the human body's circulatory system. One of them with good cable management
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Malaclypse the Middle @malaclypse.bsky.social · 15/04/2026
MA’s 2.1% should be a disgrace, rather than the best score in the nation. I guess it can be both.
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Thomas Neville @goobermunch.bsky.social · 06/04/2026
Just going to leave this here.
A series of three tweets:

Rabbi Akiva Weisinger
@MisfitTorah

1)

For those wondering why I, an Orthodox Rabbi, am outraged by the Texas trans law, aren't I supposed to stand up for Torah Values or whatever A thread:

2)

I don't like it when kids kill themselves.

3)

 End of thread.
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Mark Dexter @pedsdocdex.bsky.social · 25/03/2026
As we face a (worsened) global shortage of helium, I’m curious as to how many of my #PedsICU colleagues are still routinely using Heliox for status asthmaticus.
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Mark Dexter @pedsdocdex.bsky.social · 20/03/2026
Fascinating study from the terms of respiratory physiology, even if the findings are a bit terrifying. link.springer.com/article/10.1...
link.springer.com
Carbon dioxide overload, detected in human blood, suggests a potentially toxic atmosphere within 50 years - Air Quality, Atmosphere & Health
Air Quality, Atmosphere & Health - Anthropogenic activities are increasing the amount of carbon dioxide (CO2) in the atmosphere. There is mounting experimental evidence that lifetime exposure...
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Mark Dexter @pedsdocdex.bsky.social · 19/03/2026
Good luck today to all the M4s finding out where they matched and congratulations to all of this year’s interns on contractually obligated replacement day!
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Walker Bragman @walkerbragman.bsky.social · 07/03/2026
If allying yourself with an anti-vax lunatic and helping him gut public health in America while children die of vaccine-preventable diseases doesn’t get you expelled from academia, then the whole system is utterly broken.
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Walker Bragman @walkerbragman.bsky.social · 07/03/2026
None of these contrarian types who gladly went to work at HHS under anti-vax conspiracy theorist Robert Kennedy Jr. should ever work in academia again.
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Walker Bragman @walkerbragman.bsky.social · 07/03/2026
Perhaps an early (bad) sign of what is to come: Vinay Prasad, who helped lead a campaign against lifesaving mRNA vaccines at FDA, is being welcomed back to the University of California San Francisco, where he was prior to joining the Trump administration.
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Mark Dexter @pedsdocdex.bsky.social · 06/03/2026
Pediatric ICU doc here who’s expected measles to be pretty damn bad!
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U.S. Consumer Product Safety Commission @cpsc.gov · 06/03/2026
Soon.
A guy at a pool drinking a fruit-filled cocktail and looking at his phone. A monster is coming out of the pool behind him. The guy doesn't notice, because he is distracted by his phone. His young nephew says, "Uncle Roy, there's a guy." The text reads: Nothing good happens when you're distracted at the pool. Always watch kids at pools and spas.
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Josh Gondelman @joshgondelman.bsky.social · 27/02/2026
Every anti-vaxxer I encounter seems to love weird unregulated supplements. They hate Big Pharma but they love Little Pharma, Big Pharma’s younger sibling who grew up without any adult supervision.
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Memento (spooky) Morty 🌙 @mementomorty.bsky.social · 27/02/2026
Casey Means is unfit to be surgeon general, just like RFK Jr is unfit to lead HHS, just like Bhattacharya is unfit to lead the CDC, just like
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Memento (spooky) Morty 🌙 @mementomorty.bsky.social · 27/02/2026
They will never fully redeem themselves and erase their decision to put someone in charge who is now responsible for the death of many, but they could start by saying no to Casey Means
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Mark Dexter @pedsdocdex.bsky.social · 27/02/2026
I just wrote a @theactionnetwork.bsky.social letter: Oppose Nomination of Casey Means for Surgeon General . Write one here: actionnetwork.org/letters/oppo...
actionnetwork.org
Oppose Nomination of Casey Means for Surgeon General
The Senate HELP Committee is scheduled to hold a hearing on the nomination of Casey Means to serve as U.S. Surgeon General on Wednesday, February 25th. While we were hoping this nomination was dead, i...
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Mark Dexter @pedsdocdex.bsky.social · 27/02/2026
Absolutely LMAO at last night’s episode of The Pitt and having to teach the younger generation how to use paper charts and fax machines.
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rax ‘levon honkers’ king @raxkingisdead.bsky.social · 27/02/2026
checking into a doctor’s appointment online ahead of time is a goddamn scam. we both know you’re just going to make me do it a second time on a shitty non responsive ipad at the office anyway
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Bad Medical Takes @badmedicaltakes.bsky.social · 26/02/2026
Headline from Austin American-Statesman: Austin-based anti-vaccine activist Del Bigtree says he wants children to catch measles and polio


Subhed: Del Bigtree, founder of an Austin-based anti-vaccine nonprofit and longtime ally of Health Secretary Robert F. Kennedy Jr., told The Atlantic he believes children would be healthier if they contracted vaccine-preventable diseases.
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Mark Dexter @pedsdocdex.bsky.social · 26/02/2026
Casey Means is as qualified to be Surgeon General as Pete Hegseth is to be Secretary of Defense.
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