ニュージーランドでの感染事例 3分のカジュアルな接触(濃厚接触ではない)で感染(2020.10.24作成) #新型コロナウイルス

Eric Feigl-Ding @DrEricDing

JUST IN—CDC is changes how “close contact” is defined. Instead of previously defining “close contact” as >=15 *consecutive* minutes w/in 6 feet of #COVID19 case, it’s now w/in 6 feet of an infected case for >=15 minutes cumulatively over 24-hours. Huge. 🧵 washingtonpost.com/health/2020/10…

Eric Feigl-Ding @DrEricDing

2) “The change by The Centers for Disease Control and Prevention is likely to have its biggest impact in schools, workplaces and other group settings where people are in contact with others for long periods of time.”

Eric Feigl-Ding @DrEricDing

3) “The updated guidance is based on new evidence: CDC and Vermont health officials discovered infection of a 20-year-old prison employee who interacted with individuals who later tested positive for the virus after 22 interactions totaling 17 minutes during an 8-hour shift.”

Eric Feigl-Ding @DrEricDing

4) “Available data suggests that at least one of the asymptomatic [infectious detainees] transmitted” the virus during these brief encounters, the report said.”

Eric Feigl-Ding @DrEricDing

5) Bottomline: the old definition of within 6 feet for 15 consecutive minutes was too limited. Cumulative aggregate exposure can lead to infection. I still don’t know if the 15 minutes and 6 feet rule is sufficient given what we know about airborne transmission via aerosols.

Eric Feigl-Ding @DrEricDing

6) distance isn’t what always matter. Studies indicates that coronavirus could be persistent and stable up to 16 hours in stagnant air. Typical air exchange every 20 min to 4 hrs, depending on ventilation. #COVID19 pic.twitter.com/YJOQvEzu84

Eric Feigl-Ding @DrEricDing

7) Here is the link to the latest Vermont prison outbreak that was because of 17 aggregate minutes of intermittent visits that led to the infection of the prison guard from asymptomatic inmates. This virus is just that subtle and perniciously persistent. twitter.com/alinouriphd/st…

Dr. Ali Nouri @AliNouriPhD

CDC says contacts should be traced if they spent at least 15min within 6ft of infected individual. This report identified infected officer who spent a total of 17min within 6 ft of 6 DIFFERENT infected inmates (~3min each) calling for a change in guidance. cdc.gov/mmwr/volumes/6…

2020-10-22 05:32:37

Eric Feigl-Ding @DrEricDing

8) And not to spoil anyone’s day, but NZ contract tracing says 3 minutes of casual exposure can lead to an infection. NZ cases are rare, so unlikely any other source. twitter.com/drericding/sta…

Eric Feigl-Ding @DrEricDing

⚠️NEW: 3 minutes “casual contact” led to transmission in NZ 🇳🇿 where cases rare & contact tracing very detailed. But now “concern mounts over the revelation of one port worker contracted #COVID19 after just 3 minutes of contact w/ a sick man.” WORRISOME. nzherald.co.nz/nz/covid-19-co…

2020-10-22 06:22:00

Eric Feigl-Ding @DrEricDing

⚠️NEW: 3 minutes “casual contact” led to transmission in NZ 🇳🇿 where cases rare & contact tracing very detailed. But now “concern mounts over the revelation of one port worker contracted #COVID19 after just 3 minutes of contact w/ a sick man.” WORRISOME. nzherald.co.nz/nz/covid-19-co…

Eric Feigl-Ding @DrEricDing

2) this is precisely why the old CDC 15 consecutive minutes close contact rule was abolished. It’s now 15 cumulative minutes over a day. But clearly just 3 minutes is enough according to NZ contract tracing. twitter.com/drericding/sta…

Eric Feigl-Ding @DrEricDing

3) this is on top of the new Vermont prison epidemic of lots of short intermittent exposure to asymptomatic inmate led to prison guard contracting the Coronavirus. twitter.com/alinouriphd/st…

kai @kai958531911

NZの症例を紹介するスレッド👇 twitter.com/drericding/sta…

kai @kai958531911

CDCの15分間という濃厚接触の定義が廃止された理由であり、新たに1日で累積15分となった。しかし、ニュージーランドの接触者追跡によれば、明らかにわずか3分で十分なのだから、、、

Mochi @TsubasaMoore

NZは検査をしてるだけに、3分ほど近くにいただけで感染させてしまうなんて追跡を可能にしましたね。これは、ちょっと驚きです。 twitter.com/DrEricDing/sta…

mm @tyonarock

NZより 3分間の感染者との接触で感染。 15分ルールって、本当に意味なかった。 twitter.com/DrEricDing/sta…

köttur-lover22🐱㌠ @kottur_lover22

@tyonarock 武漢の人から、2月の時点で、「レジで隣に並んで15秒で感染」と聞いていました。

mm @tyonarock

@kottur_lover22 あると思います。両方マスクなしでゴホゴホでもしたら一瞬だと思います。当然ですよね。