“Knowledge is no load”. 20th April 2021 important tweets by Dr Eric Feigl-Ding, see profile.

20th April 2021  Time :  1 pm Irish time.

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Eric Feigl-Ding @DrEricDing Epidemiologist & Health Economist. Health Policy & Justice. Senior Fellow, FAS. Former 16 yrs @Harvard . @JohnsHopkins & @HarvardEPI alum. COVID updates Jan’20- Washington DC & Virginiafas.org/expert/eric-fe… Joined January 2009 8,654 Following484.9K Followers Followed by Independent Scientific Advocacy Group (ISAG), Rochelle Walensky, MD, MPH, and 152 others you follow

Today’s important tweets

15) Outbreak—47 positive #COVID19 of a 188 seat Vistara flight from New Delhi to Hong Kong have tested positive, after all tested negative 72 hours prior. The scariest thing? Only 8 detected before they began quarantine. 39 only identified later during hotel quarantine, 22 at day 12!
Eric Feigl-Ding @DrEricDing ·

14) Also good time to remind people that vaccines WORK, but for mild/asymptomatic transmission, they are not always perfect, as NZ ministry of health noted.

Do vaccines lower transmission? YES, absolutely. How much? By a lot—75% to 94% in recent studies. Do vaccines completely eliminate any and all transmission? NO. That is why we still need to mask after vaccinating until cases are very low or zero.

13) VENTILATION is key. Both ventilation and masks needed to reduce risk indoors. But most buildings not ventilated well enough. Airplanes usually good filtration but not when airplane is on the ground after passengers disembarked.