Serologic Survey of IgG Against SARS-CoV-2 Among Hospital Visitors Without a History of SARS-CoV-2 Infection in Tokyo, 2020–2021

Sanada, Takahiro; Honda, Tomoko; Yasui, Fumihiko; Yamaji, Kenzaburo; Munakata, Toshiaki; Yamamoto, Naoki; Kurano, Makoto; Matsumoto, Yusuke; Kohno, Risa; Toyama, Sakiko; Kishi, Yoshiro; Horibe, Takuro; Kaneko, Yoshihiko; Kakegawa, Mayumi; Fukui, Kazushige; Kawamura, Takeshi; Wang, Da-Ming; Xia, Fuzhen; He, Fan; Yamasaki, Syudo; Nishida, Atsushi; Harada, Takayuki; Higa, Masahiko; Tokunaga, Yuko; Takagi, Asako; Itokawa, Masanari; Kodama, Tatsuhiko; Kohara, Michinori

doi:10.2188/jea.je20210324

Cited by 24 publications

(25 citation statements)

References 24 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Asymptomatic infected people may be included in the machine learning model without defining them explicitly. The number of asymptomatic infected people is approximately four times larger than those with symptoms [ 48 ]. The symptomatic infected people is 1% of the total population, whereas 4% population who obtained antibodies from asympotomatic infections.…”

Section: Discussionmentioning

confidence: 99%

Did the Tokyo Olympic Games enhance the transmission of COVID-19? An interpretation with machine learning

Hirata

Kodera

Diao

et al. 2022

Computers in Biology and Medicine

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Did the Tokyo Olympic Games enhance the transmission of COVID-19? An interpretation with machine learning

Hirata

Kodera

Diao

et al. 2022

Computers in Biology and Medicine

View full text Add to dashboard Cite

“…Serum samples were assayed to determine the concentration of antibodies against SARS-CoV-2 using an iFlash 3000 chemiluminescence immunoassay analyzer (Shenzhen YHLO Biotech, Shenzhen, China), as described previously [ 15 ]. The iFlash–SARS-CoV-2 IgG-N kit detects the IgG specific for the nucleocapsid (N) protein (anti-N IgG).…”

Section: Methodsmentioning

confidence: 99%

Antibody response to third and fourth BNT162b2 mRNA booster vaccinations in healthcare workers in Tokyo, Japan

Sanada

Honda

Higa

et al. 2023

Journal of Infection and Chemotherapy

Self Cite

View full text Add to dashboard Cite

“…The ratio of people who have immunity by infection was marginal because of the number of people infected with the Delta and Omicron variants until December 17 were less than 1.5% of the total Tokyo population and 0.7% of Japan, respectively. We considered that the people infected without symptoms would be 4 times higher than that of the reported cases [32]. The impact on the individual VE is marginal before the end of June.…”

Section: Discussionmentioning

confidence: 99%

Estimation of mRNA COVID-19 Vaccination Effectiveness in Tokyo for Omicron Variants BA.2 and BA.5 -Effect of Social Behavior-

Kodera

Niimi

Rashed

et al. 2022

Preprint

View full text Add to dashboard Cite

Variability of COVID-19 vaccination effectiveness (VE) should be assessed with a resolution of a few days assuming that VE is influenced by public behavior and social activity. Here the VE for the Omicron variants (BA.2 and BA.5) is numerically derived for Japan's population for the second and third vaccination doses. We then evaluated the daily VE variation caused by our social behavior from the daily data reports for Tokyo. The vaccination effectiveness for Omicron variants (BA.1, BA.2, and BA.5) are derived from the data of Japan and Tokyo with a computational approach. In addition, the effect of different parameters regarding human behavior on VE is assessed using daily data in Tokyo. The individual VE for the Omicron BA.2 in Japan was 61% (95%CI: 57%-65%) for the vaccination second dose from our computation, whereas that for the third dose was 86% (95% CI: 84%-88%). The individual BA.5 VE for the second and third doses are 37% (95% CI: 33%-40%) and 63% (95% CI: 61%-65%). The reduction of daily VE from estimated value was close correlated to the number of tweets related to social gathering in Twitter. The number of tweets considered here would be one of new candidates for VE evaluation and surveillance affecting the viral transmission.

show abstract

Serologic Survey of IgG Against SARS-CoV-2 Among Hospital Visitors Without a History of SARS-CoV-2 Infection in Tokyo, 2020–2021

Cited by 24 publications

References 24 publications

Did the Tokyo Olympic Games enhance the transmission of COVID-19? An interpretation with machine learning

Did the Tokyo Olympic Games enhance the transmission of COVID-19? An interpretation with machine learning

Antibody response to third and fourth BNT162b2 mRNA booster vaccinations in healthcare workers in Tokyo, Japan

Estimation of mRNA COVID-19 Vaccination Effectiveness in Tokyo for Omicron Variants BA.2 and BA.5 -Effect of Social Behavior-

Contact Info

Product

Resources

About