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Eric Feigl-Ding Profile picture
@DrEricDing
Jan 24, 2021 • 22 tweets • 10 min read • Read on X
SWITCH TO PREMIUM MASKS—I’ve been saying it for months. We need to switch to KN95, KF94, or European FFP2 masks ASAP. The new #b117 #COVID19 is just too contagious. Cloth isn’t enough anymore folks. Germany 🇩🇪 & Austria 🇦🇹 mandating on all public transits. washingtonpost.com/world/europe/e… Image
2) there are many masks that have 94/95% filtration... Image
3) N95 masks are more rare outside of hospitals because they are in shortage and needed by HCWs. You might find some NIOSH N95 from wood working, but note those are often not fluid resistant. ImageImage
4) Like Germany and Austria, in France, the country’s health advisory council on Monday discouraged the wearing of inefficient cloth and homemade masks, also arguing they may not offer sufficient protection against the more highly transmissible coronavirus variants.
5) of all the masks tested, N95 grade and surgical masks were superior this mask study. N95 class the best — they didn’t test KN95 but we know they are similar in filtration (but less perfect in fit tightness). But KN95 and KF94 and FFP2 all 94/95% good.

advances.sciencemag.org/content/6/36/e… Image
6) FFP2 masks (resemble KN95) in Europe are now $1.2 each these days ($2-3 before) after EU negotiated with manufacturers.

Also get this — low income families get these premium FFP2 masks **for free**!!!
7) Some call FFP2 masks “N95” on some boxes in EU. This was just 2 euros each. Made in U.K. 🇬🇧 as well as in Germany.
8) My favorite premium mask is the South Korea 🇰🇷 made KF94 that everyone wears there. It has a folding system that leaves more space for your mouth — so much that you forget you’re wearing a mask when you’re speaking! You can find them online.
9) Double masking (like Joe Biden when he traveled last year) also works. Or if you have a mask with a vent, wear another mask over the vented one.
10) There are also kids FFP2 and KN95 masks for better fit for kids too. Masks must FIT TIGHTLY or else leakage around nose bridge makes it less effective.

GOOD FIT == mask will expand when u exhale and push inward when you inhale. If your mask doesn’t, it’s too loose.
11) I honestly fiddle with nose bridge of a new mask a lot sometimes when i first get a new one— I press the nose bridge tightly first and then stick it on my nose to shape it. Pre press it then put on nose to shape it most efficiently. If you glasses fog up—there is a leak.
12) There are fake N95 / KN95 being sold right now. Just be careful. I can’t say which are real or fake but they do exist.

Staples and many major stores now sell KN95s. Presumably (?) they sell legit ones. I also directly order KF94 from S Korea & FFP2 from relatives in Europe.
14) To be clear, cloth masks do work too, just to lesser degree. And cloth is to catch your droplets more rather than be good inhalation filters. That’s why cloth works best when >95% of people wear them. But if many anti mask, then that is less effective.
14b) This was last week—they now mandating the premium masks in more places in Europe now. As result they are being given out free or subsidized to just $1.20 each in stores in Europe. We need Biden WH to DPA produce them here soon.
15) For more on the science of masks and an good detailed evidence thread, see this earlier 🧵 below.
16) Why do I care so much?

1 year ago today, I posted the “HOLY MOTHER OF GOD” warning to the world.

Hope it helped some folks keep their families safe. Please be careful everyone.

nymag.com/intelligencer/… Image
17) Why am I so concerned about #B117? Because many many models all show it will likely take over countries in infect and we lose buffer of what little containment we do half if it takes over.
18) Notably, the #B117 variant virus is such a beast—suppose we have 1000 cases/day now... with an R=0.86 we could reduce it to 500/day in 2 weeks.

➡️But w/ added contagiousness of B117 variant that has ~60% higher R, in 2 weeks, 3000 new cases/day instead—

6x vs old ⚠️ Image
19) UK 🇬🇧 former health minister now also urging mandates for premium masks on mass transit and shops. news.sky.com/story/covid-19…
20) What is the best source of premium masks? That would be @projectn95. Their masks are the most thoroughly vetted as authentic. And they are a nonprofit organization.
21) @projectn95 also fulfills N95 grade masks for both public and healthcare providers. Their email is listed below.

I receive zero commissions and not been paid in any way for this post.

@projectn95 is simply one of the best nonprofits.
projectn95.org/ppe-for-public Image
22) A reckoning of all the ways the Trump WH failed on PPE procurement and lack of sufficient mask production.

nytimes.com/2020/11/17/mag…

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More from @DrEricDing

Eric Feigl-Ding Profile picture
Jun 16
📍 THE 17 FIRED MEMBERS OF CDC’s VACCINE ADVISORY COMMITTEE (ACIP) speak out…

📍“As former ACIP members, we are deeply concerned that these destabilizing decisions, made without clear rationale, may roll back the achievements of US immunization policy, impact people’s access to lifesaving vaccines, and ultimately put US families at risk of dangerous and preventable illnesses.” 🔥

Full text:

Vaccines are one of the greatest global public health achievements. Vaccine recommendations have been critical to the global eradication of smallpox and the elimination of polio, measles, rubella, and congenital rubella syndrome in the US. They have also dramatically decreased cases of hepatitis, meningitis, mumps, pertussis (whooping cough), pneumonia, tetanus, and varicella (chickenpox), and prevented cancers caused by hepatitis B virus and human papillomaviruses.1 Recent scientific advancements enabled the accelerated development, production, and evaluation of COVID-19 vaccines, leveraging novel technologies that are estimated to have prevented approximately 1.6 million hospitalizations and 235 000 deaths in the US alone.2
For more than 60 years, the Advisory Committee on Immunization Practices (ACIP)—codified in the federal regulations (42 USC 217a: advisory councils or committees)—has served as a panel of experts that reviews the most up-to-date evidence on vaccines and monoclonal antibodies (eg, against respiratory syncytial virus [RSV]), providing sound recommendations to the US Centers for Disease Control and Prevention (CDC) regarding how vaccines should be used. ACIP recommendations are the cornerstone of the immunization program in this country. First, they serve as guidance and are the national standard for the use of Food and Drug Administration (FDA) authorized and licensed vaccines, providing a unified and trusted approach to vaccinations for the diverse array of immunization providers across the US. Second, they ensure science-based and tested immunization schedules that are optimized for well-timed protection against serious diseases. Third, the recommendations affect insurance coverage and safeguard broad access for vaccines. Fourth, ACIP’s continued monitoring of disease epidemiology and scrutiny of vaccine safety inform timely updates to recommendations that have maintained the trust and protection of the population. This transparent and ongoing surveillance of vaccines is one of the most stringent around the world, historically making the deliberations and decisions of this committee a beacon for immunization programs globally, while also serving as the foundation for recommendations harmonized with leading medical organizations in the US.3,4
ACIP committee members have always been selected through a rigorous process based on their expertise in immunology, epidemiology, pediatrics, obstetrics, internal and family medicine, geriatrics, infectious diseases, and public health. Historically, committee members were chosen because they worked at hospitals, clinics, health departments, universities, and other organizations where they dedicated themselves to caring for patients, conducting research, and helping to prevent and treat infectious diseases. Members’ deep understanding of immunization issues ensured that vaccine policies were grounded in scientific evidence, aligned with the needs of economically, socially, and medically diverse US communities, and always considered the public value, trust, and acceptability of vaccines.
Despite recent suggestions to the contrary, health care providers and the US public trust ACIP. For the past 18 years, the National Immunization Survey has shown that 99 of every 100 children in the US have received at least some recommended vaccines by 2 years of age, consistent with acceptance of ACIP recommendations implemented by trusted clinicians (National Immunization Survey - Childof Healthy People 2030).…Image
2) Full text part 2:

This does not suggest the population is so distrustful that it warrants dismantling the process by which vaccines have been recommended. ACIP standard procedures have minimized the risk of alleged conflicts of interest and biases. For decades, members of ACIP have undergone a thorough application and review process to participate. Proposed members submitted letters of support from other known experts and peers, completed an interview process, underwent a background check, and disclosed financial interests that might be considered a conflict, including any professional or financial relationships of immediate family members. Historically, it has taken up to 2 years for nominees to be approved to join ACIP.
Once part of the committee, ACIP members spent significant time preparing for meetings, reviewing the scientific evidence, and chairing work groups that, along with many CDC public health officials, led to the final recommendations that were determined during public meetings, which also included opportunities for public comment. Recordings of these meetings, agendas, and presentations were publicly available. Additionally, members agreed to ongoing monitoring and disclosure throughout their tenure. For example, potential conflicts of interest were reviewed throughout their time on the committee. Statements about potential conflicts were required during each meeting and before each vote, and members recused themselves from voting if any conflicts were identified. These disclosures have also recently been posted on the CDC website for public scrutiny. ACIP was among the most stringent and transparent of the federal committees, and we hope those criteria will apply to any new members joining the committee.
The abrupt dismissal of the entire membership of the ACIP, along with its executive secretary, on June 9, 2025, the appointment of 8 new ACIP members just 2 days later, and the recent reduction of CDC staff dedicated to immunizations have left the US vaccine program critically weakened.5,6 These actions have stripped the program of the institutional knowledge and continuity that have been essential to its success over decades. Notably, the ACIP charter specifies that committee members serve overlapping terms to ensure continuity and avoid precisely the disruption that will now ensue. The termination of all members and its leadership in a single action undermines the committee’s capacity to operate effectively and efficiently, aside from raising questions about competence.
Compounding these concerns, recent changes to COVID-19 vaccine policy, made directly by the HHS secretary and released on social media, appear to have bypassed the standard, transparent, and evidence-based review process.7 Such actions reflect a troubling disregard for the scientific integrity that has historically guided US immunization strategy. The newly stated strategy to replace ACIP members with individuals who will “exercise independent judgment, refuse to serve as a rubber stamp, and foster a culture of critical inquiry” is already leading to warnings by academic and scientific institutions, professional organizations, and the public who for decades have known well that these sought-after qualities precisely characterized the now-dismissed members of the ACIP.5
3) Part 3:

As former ACIP members, we are deeply concerned that these destabilizing decisions, made without clear rationale, may roll back the achievements of US immunization policy, impact people’s access to lifesaving vaccines, and ultimately put US families at risk of dangerous and preventable illnesses. Vaccines and the anti-RSV monoclonal antibodies are lifesaving, and people in the US deserve to have recommendations and broad access to use them to prevent serious diseases. In this age of government efficiency, the US public needs to know that the routine vaccination of approximately 117 million children from 1994-2023 likely prevented around 508 million lifetime cases of illness, 32 million hospitalizations, and 1 129 000 deaths, at a net savings of $540 billion in direct costs and $2.7 trillion in societal costs.8Finally, as individuals, we remain committed to evidence-based vaccine policy, both through our ongoing work in immunization science, public health, and medical education, and by supporting future efforts to keep America healthy that uphold scientific rigor and the public’s trust.
Read 4 tweets
Eric Feigl-Ding Profile picture
May 8
⚠️Tariffs On Medications Will Make America Sick

We might soon see the Trump WH impose tariffs on pharmaceuticals—patients will suffer and die.

During the past few weeks, President Trump’s on-again, off-again tariff wars have rattled the stock market, decimated many Americans’ retirement funds, and promised to send grocery prices soaring—and his administration hasn’t even gotten to critical pharmaceutical tariffs yet. But that will likely be the next shoe to drop.
Trump exempted pharmaceuticals from his first round of tariffs in early April, but recently declared that he intends to impose “a major tariff” on imported medicines “very shortly.” These tariffs, he claims, will prompt pharmaceutical companies to leave countries including China and India and begin “opening up their plants all over the place.”
Commerce Secretary Howard Lutnick said in a television interview in mid-April that these tariffs are coming in the “next month or two.”

What will this mean? 

Read on:
progressive.org/op-eds/tariffs…Image
2) The majority of brand name drugs used in the United States are imported. Even generic drugs often rely on ingredients and direct imports from China, including pain relievers and cardiovascular drugs used by millions.
3) The United States was already facing a drug shortage crisis before Trump’s tariff announcement. Now, his policies will drive upnot only the cost of medicines, but also other health care items such as X-ray machines and medical instruments.
Read 8 tweets
Eric Feigl-Ding Profile picture
Apr 10
It’s a trap: CATCH 22—if you register, ICE will deport you. If you don’t register, you’ve now committed a crime for the first time, and ICE will deport you. Trump doesn’t care if you’ve paid all taxes and followed all laws—ICE will deport you.

apnews.com/article/illega…Image
2) The Department of Homeland Security announced that it was mandating that all people in the United States illegally register with the federal government, and said those who didn’t self-report could face fines or prosecution. ***Failure to register is considered a crime***
3) Registration will be mandatory for everyone 14 and older without legal status. People registering have to provide their fingerprints and address, and parents and guardians of anyone under age 14 must ensure they registered. The registration process also applies to Canadians who are in the U.S. for more than 30 days, such as so-called snowbirds who spend winter months in places like Florida.
Read 4 tweets
Eric Feigl-Ding Profile picture
Apr 3
Now economists know how scientists felt back when he pushed “hydroxychloroquine”
2) HCQ preventing COVID deaths has been debunked— and it’s now been linked with deaths.

@JoshuaPCohen1
forbes.com/sites/joshuaco…Image
@JoshuaPCohen1 3) JPMorgan on Trump Tariffs: “The largest tax increase since 1968” Image
Read 6 tweets
Eric Feigl-Ding Profile picture
Mar 28
My god—Earthquake (a Richter ~7.7) causes a skyscraper to collapse in Bangkok. Hope all the construction workers made it out.
2) this skyscraper collapse was captured from a distant car’s dashcam while on a highway

3) another view of the collapse. For those who lived through 9/11, this collapse is a bit triggering.
Read 5 tweets
Eric Feigl-Ding Profile picture
Mar 27
Welp—kiss public health & medical research infrastructure in America goodbye for the next 4 years. RFK Jr plans to cut 10,000 jobs from Trump HHS. Image
2) this will not make America healthy again… not by a long shot. So dangerous and irresponsible.
3) “Kennedy is set to announce Thursday the planned changes, which include axing 10,000 full-time employees spread across departments tasked with responding to disease outbreaks, approving new drugs, providing insurance for the poorest Americans and more”.
Read 5 tweets

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