New study from Tokyo measuring antibodies of asymptomatic workers from 1 company is claiming 47% of the pop. of Tokyo (14M) have developed antibodies to SARS-COV-2. Findings from the paper is already spreading in certain circles. Does it make sense? 1/n
This study is getting some attention, but results look odd – if group developed antibodies during 2nd outbreak, would expect increase in seroprevalence to occur near the August peak, rather than a few weeks beforehand (during period with few cases)... 1/
New study: Japan has one of the highest COVID infection rates in the world, the world's oldest population, yet also one of the lowest COVID death rates. They also had no wide spread lock down and no mass testing. Are people asking the right questions?🤔
Remember when I said that SARS-CoV-2 is far more widespread than realized? 46.8% AB+ in Japan “C-19 infection may have spread widely across the general population of Tokyo despite the very low fatality rate” Well here’s your proof! H/T 1
Dynamic Change of COVID-19 Seroprevalence among Asymptomatic Population in Tokyo during the Second Wave Seroprevalence increased from 6 % to 47 % over the summer. Most dramatic increase occurred in late June and early July.
New scientific article finds that Tokyo has 46.8% with antibodies, no lockdown, low death rate, and big increase in immunity during summer: “Seroprevalence increased from 5.8% to 46.8% over the course of the summer.” h/t
Most striking to me from the new paper out of Japan: "81.1% of IgM positive cases at first testing became IgM negative in approximately one month." If this ain’t some fluke—it means our estimates of cumulative incidence could be wildly off.
Japan: Low fatality rate with no lockdown 👉Rise in seropositivity and decrease in reported CV19 cases occurred w/out shut-down; herd immunity implicated?
According to this preprint, Tokyo reached an est. 46.8% seroprevalence this summer. The city has had a total of 391 deaths from COVID-19. This would suggest an infinitesimal fatality rate—twice the spread of New York and a tiny fraction of its IFR. (1/2)
Can you explain to us why Japan has sky-high seroprevalence but very few deaths?
Dynamic Change of COVID-19 Seroprevalence among Asymptomatic Population in Tokyo during the Second Wave wtf is going on in the world
Dynamic Change of COVID-19 Seroprevalence among Asymptomatic Population in Tokyo during the Second Wave #medRxiv
3/n Parmi les 1877, 615 ont eu au moins un test. Et parmi ceux qui avaient été testés plusieurs fois 21% de ceux qui avaient été testés négatifs sont devenus positifs et 12% de cx qui avt été testés + sont dévenus négatifs
Impressive seroprevalence in this population in Tokyo (not preprint) Dynamic Change of COVID-19 Seroprevalence among Asymptomatic Population in Tokyo during the Second Wave
Impressive seroprevalence in this Tokyo cohort (note preprint, not peer reviewed) Dynamic Change of COVID-19 Seroprevalence among Asymptomatic Population in Tokyo during the Second Wave
Quite incredible. Perhaps a little too incredible. A (very small) sample indicating 50% of Tokyo infected despite negligible levels of morbidity and mortality.