Professor of Medicine at @UAZMedTucson. Medical Director at @AzCIM. Molecular Immunologist. Opinions mine.
Tucson, AZ
Joined August 2009
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Randy Horwitz, MD, PhD FACP retweeted
Child dies of measles in Wisconsin’s first such death since 1990 — via @AP trib.al/Tuh7mxt
Randy Horwitz, MD, PhD FACP retweeted
South Carolina's measles outbreak:
997 cases. 932 of them unvaccinated.
Voters noticed
They noticed this was wrong
They just elected paediatrician @AnnieAndrewsMD to the Senate.
Randy Horwitz, MD, PhD FACP retweeted
Sunday: I’ll do a quick fact check of this insane RFK Jr interview
Monday: I’m up to 40 lies & it was only a 3 min clip!
Tuesday: Ready to defend my 2nd PhD thesis on fascist quackery
That's why @SaveAmericaMvm & I are holding him accountable
rasmussenretorts.substack.co…
Your healthcare dollars at work. We know who's to blame...
cnn.com/2026/07/24/health/us…
Randy Horwitz, MD, PhD FACP retweeted
thrilled to share that i now contain the sum total of all human knowledge
Randy Horwitz, MD, PhD FACP retweeted
We have joined @IDSAInfo, @ASMicrobiology, and 19 other medical, scientific, public health and patient organizations, in calling for the resignation of HHS Secretary Robert F. Kennedy Jr., to ensure the health of the American people.
Read the statement in full: news.aai.org/2025/09/04/join…
ALT Quote graphic that reads "We are gravely concerned that American people will needlessly suffer and die as a result of policies that turn away from sound interventions. After careful consideration, we insist on Kennedy’s resignation to restore the integrity, credibility and science-driven mission of HHS and all its agencies." with AAI logo
Randy Horwitz, MD, PhD FACP retweeted
I see your shocking and raise it to fucking outrageous.
These are lies designed to keep American taxpayers from being able to access safe and effective vaccines. It weakens our ability to respond. In the long run, more people will die in a H5N1 pandemic.
This comment from HHS on the decision to stop funding the $MRNA bird flu vaccine is honestly shocking:
"This is not simply about efficacy—it’s about safety, integrity, and trust. The reality is that mRNA technology remains under-tested, and we are not going to spend taxpayer dollars repeating the mistakes of the last administration, which concealed legitimate safety concerns from the public.”
statnews.com/2025/05/28/mode…
“When it comes to a question like raw milk, I want to be free to form a relationship with a local farmer, understand his integrity, look him in the eyes, pet his cow, and then decide if I feel safe to drink the milk from his farm”. --Casey Means /1
Nice! Keep it up, @angie_rasmussen !!! nature.com/articles/s41577-0…
I'm sorry, but this is unacceptable: "Ms Iwasaki" and "Dr. Krumholz." It is an insult to women and to scientists (and esp to women scientists)...Great Op-Ed, though😠
If we really want to take on chronic diseases.....
by @virusesimmunity and @hmkyale
#LongCovid, post-infection syndromes, immune system assessment and intervention
gift link wsj.com/opinion/how-to-lead-…
Randy Horwitz, MD, PhD FACP retweeted
So this interview lasted 2 hours so this “you’re scaring me” part might seem like an overreaction or fearmongering to someone without that context.
There’s a lot of evidence to support my hypothesis that a potential H5N1 pandemic would be worse than COVID.
Talked to @BillWhitakerCBS on @60Minutes about H5N1. As Kamran Khan @hellobluedot told Bill, we don’t know if or when this virus might acquire pandemic capabilities, but it can.
And if it does, as I told Bill, that will be worse than COVID. Much worse.
cbsnews.com/news/bird-flu-ri…
Just when you're complaining about Mondays, the mail comes and changes your mind. @CellCellPress @NatureMedicine
Shout out to a great immunologist @GuthmillerJenna for her quote in NYT yesterday: "...the best option is honestly just to get the vaccine.” nytimes.com/2022/09/01/healt…
Whoa...I promise not to tell the WSJ Editorial Board how to invest, if they promise not to tell Med School faculty how to teach med students. Very inappropriate. wsj.com/articles/medical-tra…
Randy Horwitz, MD, PhD FACP retweeted
Many attendees came back from this emergency medicine conference with COVID. Masking at the conference itself was optional; the social events... 🤦🏻♀️ It’s not a great time to be on back up!
This quoted post is unavailable.
Wonderful op-ed and even better immunology research by @VirusesImmunity
nytimes.com/2022/05/16/opini…
