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Dr Kevin Purcell
Chemical Physics PhD under SRS. Scientist & Programmer. I like & (re)tweet “interesting” things—no endorsements! 73 N7WIM
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Dr Kevin Purcell retweeted
BNO Newsroom 4h
NEW: French government declares Paris a "red" COVID zone, allowing local authorities to re-impose certain restrictions - Reuters
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Dr Kevin Purcell retweeted
BNO Newsroom 4h
JUST IN: New Zealand extends Auckland lockdown until August 26. Live press conference:
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Dr Kevin Purcell retweeted
ɪᴀɴ ᴍ. ᴍᴀᴄᴋᴀʏ, ᴘʜᴅ 🦠🤧🧬🥼🦟🧻 4h
Replying to @MackayIM
🇳🇿can expect to see more cases in this cluster-just based on known incubation period 🇳🇿it *is* possible to contain outbreak without knowing origin; important to establish a perimeter to stop it growing
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Dr Kevin Purcell retweeted
SFBART 9h
Absolutely. BART currently use MERV-8 filters but testing MERV-14 in 5 train cars as a pilot if they do a better job filtering. Staff raised questions if MERV-14 would be any more effective. Hopefully we'll know an answer soon!
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Dr Kevin Purcell retweeted
Bob Wachter 6h
Replying to @Bob_Wachter
17/ … and, did his use of term “herd immunity” lead to some pushback, partisan or otherwise (Answer: yes, a lot – mostly that “you shouldn’t say that because it’ll cause people to behave less carefully.”) But he feels that his job is to describe science clearly. Which he did.
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Dr Kevin Purcell retweeted
Bob Wachter 6h
Replying to @Bob_Wachter
16/ …ie, different segments of population engage in different risk-behaviors (Answer: yes, it would be more accurate); Does fact that San Quentin Covid hit rate is ~60% refute argument (Answer: no, probably no way to decrease "connectivity" at SQ because of conditions there)...
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Dr Kevin Purcell retweeted
Bob Wachter 6h
Replying to @Bob_Wachter
15/ I asked lots of questions (@ 52:40-1:05:30), incl.: whether behavioral change is dynamic (Answer: yes; “I can predict how virus is going to behave better than I can predict how people are going to behave”); Whether population modeling should reflect heterogeneous behavior…
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Dr Kevin Purcell retweeted
Bob Wachter 6h
Replying to @Bob_Wachter
14/ Figure shows that w/o behavioral change, need 60% of people immune to push transmission rate <1. But if you halve amount of “connectivity” (via masks, distancing), then you may reach equivalent of herd immunity at infection levels of ~20-30% (as in NYC, maybe FL?), not 60%
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Dr Kevin Purcell retweeted
Bob Wachter 6h
Replying to @trvrb @Twitter
13/ Next up: Trevor Bedford describes idea he raised on : that the classical herd immunity threshold of 60% may be too high, in that it doesn’t account for impact of behavioral change. @ 39:45-52:00, he elegantly reviews science & numbers.
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Dr Kevin Purcell retweeted
Bob Wachter 6h
Replying to @Bob_Wachter
6/ Unfortunately, PCR tests are expensive, not scalable, and pretty slow (thus testing delays). @ 9:50-19:30, Mina makes the case that trading off some sensitivity (in PCR) for cheap, highly accessible home antigen tests that can be used daily is optimal strategy for prevention.
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Dr Kevin Purcell retweeted
Bob Wachter 6h
5/ On to grand rounds: 1st speaker: , who is studying a new paradigm for viral testing. He points out that usual PCR test for virus is more sensitive than it needs to be, finding many cases that have very low levels of virus, below transmission level.
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Dr Kevin Purcell 3h
Replying to @UWVirology
Most test ever (so a lower positivity with a similar number of positives for a normal day). The background number of new cases is in the 250-300 region. ~2000 new cases per week and very slowly dropping.
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Dr Kevin Purcell 4h
Most test ever (so a lower positivity with a similar number of positives)
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Dr Kevin Purcell 4h
The distraction is over?
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Dr Kevin Purcell retweeted
BNO Newsroom 9h
UPDATE: New Zealand reports 12 new coronavirus cases and 1 new probable case, raising total from new outbreak to 30. One of the new cases is of unknown source
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Dr Kevin Purcell retweeted
An Leavy 9h
NZ 2 more workers have tested positive at Americold according to the managing director 6 total at the business to date per
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Dr Kevin Purcell retweeted
Dr. Tom Frieden 9h
A comprehensive response can stop Covid and allow us to restart our economy and society. * Reduce spread (close bars/restaurants/gatherings; 3W's -mask, hand washing, distance) * Stop cases/clusters (test/trace/isolate) * Protect ongoing health care * Use data to drive progress.
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Dr Kevin Purcell retweeted
BNO Newsroom 10h
NEW: Dario Vivas, the governor of Venezuela’s capital district and a key ally of Nicolas Maduro, has died of COVID-19 - Reuters
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Dr Kevin Purcell 7h
“Our results suggest that most BMPC generated by influenza vaccination in adults are short-lived.” “Designing strategies to enhance their persistence will be a key challenge for the next generation of influenza vaccines.”
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Dr Kevin Purcell 8h
Tim Declerq’s back after getting caught in a hailstorm at the end of the second stage of the Tour de Dauphiné.
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