sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 11/11/2025FINALLY, California public health🥑 got it right ✅. Now they show N95 as clearly superior b/c it has head-straps versus KN95/KF94, "They provide less protection than N95s because they have ear loops." www.cdph.ca.gov/Programs/CID... 11911
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 16/09/2025HOW LONG DO MERV 16 FILTERS LAST 🏃🏃♀️🏃♂️? CDC researcher Christopher Barnes and I decided to find out: 2 DIY SAFE boxes in elementary school 🏫 (16 months) vs 3 DIY SAFE boxes (4 months) in middle school 🏫 All used daily (per teacher reports). 131
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 28/07/2025J Haz Mat (April 5, 2025): "Our study is the first to directly compare the relative effectiveness of GUV devices (upper-room 254 nm and whole-room 222 nm) and HEPA filters to remove/inactivate model virus laden aerosol in an occupied clinical room."sciencedirect.comUltraviolet radiation vs air filtration to mitigate virus laden aerosol in an occupied clinical roomMitigation measures against infectious aerosols are desperately needed. We aimed to: 1) compare germicidal ultraviolet radiation (GUV) at 254 nm (254-… 011
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 08/06/20252 YEARS UPDATE on DIY: This week I tested 10 DIY purifiers in 4 classrooms (160 in use). Still working great!! ✅ CDC & CDPH say we need 5+ air changes per hour (ACH). 🌪️ When I tested $1000+ district-supplied HEPA only 2.5 ACH (sp 2) vs 6.3 ACH for $400 DIY (sp 1) 👀 (1/4) 242
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 31/05/2025New review in BMJ by @trishgreenhalgh.bsky.social says for respiratory protection from viruses/bacteria in air: N95 > surgical > cloth masks > nothing ❗️but only if continuously worn not intermittently. (e.g. taken off for discomfort/eating) www.bmj.com/content/388/...bmj.comThe role of masks and respirators in preventing respiratory infections in healthcare and community settingsThe covid-19 pandemic saw frequent changes and conflicts in mask policies and politicization of masks. On reviewing the evidence, including studies published after the pandemic, the data suggest respi... 031
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 13/05/2025According to Quinn, “apart from an elevated risk of venous thromboembolism within 1 year..” “many of the post-acute consequences of COVID-19 may be related to the severity of infectious illness necessitating hospitalization rather than being the direct consequence of infection with SARS-CoV-2.” 010
Reposted by @sri-srikrishna.bsky.socialTomás Aragón (托马斯·阿拉贡) @tomasaragon.bsky.social · 14/04/2025Pay attention to *all* variables. If you get in trouble but your cell phone has no service -- you're still in trouble. If you have cell service but EMS is 1 hour away -- you're still in trouble. 021
Reposted by @sri-srikrishna.bsky.socialTomás Aragón (托马斯·阿拉贡) @tomasaragon.bsky.social · 13/04/2025Starting to heat up. Share this informative infographic I created for heat waves. There are many variables to consider. Stay safe! 111
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 10/04/2025From COVID-19 hospital wards in Greece: • "Air viral load in COVID clinic ranged from 25,9 to 1123,7 copies/m3." • "Air cleaner showed an effective reduction of air viral load, reaching 98.1%." www.sciencedirect.com/science/arti...sciencedirect.com“SARS-CoV-2 airborne detection within different departments of a COVID-19 hospital building and evaluation of air cleaners in air viral load reduction”The pandemic of COVID-19 has brought in light the necessity for the development of novel detection methods for airborne transmitted pathogens, and the… 035
Reposted by @sri-srikrishna.bsky.socialRichard Corsi @corsiaq.bsky.social · 30/03/20251/ The CR Box behind me has been operating for well over 3,000 total hours over the past year (avg about 65 hours per week). It's definitely not looking shiny new. Nonetheless, I just did triplicate measurements of ultrafine particle (UFP) concentrations outside and inside the box ..... more 311426
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 28/03/2025This WHO video seems to attribute particulate air pollution to smokestacks and vehicles but as we are finding out, are wildfires, land fires, and burning of vegetation a more significant source of particulate pollution globally? www.nature.com/articles/s41...nature.comGlobal population exposure to landscape fire air pollution from 2000 to 2019 - NatureThe global population is increasingly exposed to daily landscape fire-sourced air pollution but there are socioeconomic disparities, with this pollution four times higher in low-income countries than ... 000
Reposted by @sri-srikrishna.bsky.socialRichard Corsi @corsiaq.bsky.social · 26/03/2025Thanks to Amudalat Ajasa for this story about the significant benefits of CR Boxes for wildfire smoke particles and other indoor aerosol particles (including virus-laden respiratory aerosol particles, pollen, mold, particles from cooking, etc.). www.washingtonpost.com/climate-solu...washingtonpost.comThese DIY air purifiers could make clean air more accessible during wildfiresHomemade air purifiers can filter air faster, making them an affordable alternative to more expensive commercial products. 35824
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 04/03/2025In Nature Medicine, we highlight 8 steps to prevent H5N1 🦅 🐄 🐓 (bird flu) from becoming a pandemic. Free access at rdcu.be/ea153 w/ @ranudhillon.bsky.social @abraarkaran.bsky.social Robert Garryrdcu.beSteps to prevent and respond to an H5N1 epidemic in the USANature Medicine - Steps should be taken now to prevent an epidemic of H5N1 in humans and prepare for an outbreak should it occur. 162
Reposted by @sri-srikrishna.bsky.socialsri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 26/02/2025Free access to the article here rdcu.be/ea153rdcu.beSteps to prevent and respond to an H5N1 epidemic in the USANature Medicine - Steps should be taken now to prevent an epidemic of H5N1 in humans and prepare for an outbreak should it occur. 001
Reposted by @sri-srikrishna.bsky.socialAbraar Karan, MD, MS, MPH, DTM&H @abraarkaran.bsky.social · 25/02/2025Our commentary in Nature on immediate steps to combat the #H5N1 bird flu outbreak. @ranudhillon.bsky.social @sri-srikrishna.bsky.social www.nature.com/articles/s41... 294
Reposted by @sri-srikrishna.bsky.socialRanu Dhillon @ranudhillon.bsky.social · 24/02/2025If H5N1 evolves to spread between people, it could spur a pandemic In @naturemedicine.bsky.social, @sri-srikrishna.bsky.social Robert Garry @abraarkaran.bsky.social & I discuss the mutations it may take for this to happen & what we could do now to stop it & be prepared in case it does rdcu.be/ea153rdcu.beSteps to prevent and respond to an H5N1 epidemic in the USANature Medicine - Steps should be taken now to prevent an epidemic of H5N1 in humans and prepare for an outbreak should it occur. 154
Reposted by @sri-srikrishna.bsky.socialChristophe Veltsos @drinfosec.bsky.social · 08/02/2025🎯 Absolutely brilliant 👇 Link: govwayback.com 24118
Reposted by @sri-srikrishna.bsky.socialKrutika Kuppalli, MD FIDSA @krutikakuppalli.bsky.social · 07/02/2025I’m relieved that MMWR is back online, but I’m worried about what’s next. From what I understand, three articles on H5N1 were supposed to be published before the administration paused public health communications. 2355
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 01/02/2025Not too surprising that pollution 🔥 💨🚬 🚘 (PM 2.5) is linked to lung 🫁 cancer, but why would it increase risk of ANY CANCER? “for every 10 microgram per cubic meter (µg/m3) of increased exposure to PM2.5, risk of dying from any cancer rose by 22 percent.” 132
Reposted by @sri-srikrishna.bsky.socialChristophe Veltsos @drinfosec.bsky.social · 17/01/2025Interesting 🧵 by @sri_srikrishna (on X) about #IAQ: "BIG NEWS: Yesterday California public health 🥑 just recommended to at least 5 air changes per hour in ALL ROOMS (occupied). Seismic..." threadreaderapp.com/thread/18801... 54820
Reposted by @sri-srikrishna.bsky.socialDr Satoshi Akima, FRACP @toshiakima.bsky.social · 06/12/2024Thanks to a Nature editorial, this paper by Richard P Sear has caused a stir. The study is helpful, but the mathematical modelling is only as good as the underlying assumptions. 🧵 journals.aps.org/pre/abstract...journals.aps.orgEstimating the population-level effects of nonpharmaceutical interventions when transmission rates of COVID-19 vary by orders of magnitude from one contact to anotherStatistical physicists have long studied systems where the variable of interest spans many orders of magnitude, the classic example is the relaxation times of glassy materials, which are often found t... 1213534
Reposted by @sri-srikrishna.bsky.socialDr Satoshi Akima, FRACP @toshiakima.bsky.social · 06/12/2024In summary: great study but it should have modelled fit factors of 3 (typical of a surgical mask or KN95), 10 (poorly fitted earloop FFP2), 30 (modestly badly fitting FFP2), 70 (modest failure) and 100 (bare pass). www.nature.com/articles/d41...nature.comWhat if everyone had masked up? Analysis of app data has an answerModelling study based on almost 250,000 positive COVID-19 tests in the United Kingdom shows that universal masking could have cut transmission markedly. 3336
sri-srikrishna.bsky.social @sri-srikrishna.bsky.social · 05/12/20241st study found Covid risk was flight duration-dependent, 25x on long vs short flights, inconsistent with boarding and deplaning being higher risk than inflight. “each hourly increase in flight duration increased the incidence rate by 1.53-fold.”news-medical.netStudy shows enforced masking on long flights prevents SARS-CoV-2 transmissionA recent study reveals that longer flights without enforced masking significantly increase the risk of SARS-CoV-2 transmission, while enforced masking on long-haul flights effectively prevents in-flig... 297
