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10.1016/j.isci.2021.102646

http://scihub22266oqcxt.onion/10.1016/j.isci.2021.102646
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suck abstract from ncbi


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pmid34056566      iScience 2021 ; 24 (6): 102646
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  • SARS-CoV-2 seroprevalence in the urban population of Qatar: An analysis of antibody testing on a sample of 112,941 individuals #MMPMID34056566
  • Coyle PV; Chemaitelly H; Ben Hadj Kacem MA; Abdulla Al Molawi NH; El Kahlout RA; Gilliani I; Younes N; Al Anssari GAAA; Al Kanaani Z; Al Khal A; Al Kuwari E; Butt AA; Jeremijenko A; Kaleeckal AH; Latif AN; Shaik RM; Abdul Rahim HF; Nasrallah GK; Yassine HM; Al Kuwari MG; Al Romaihi HE; Al-Thani MH; Bertollini R; Abu-Raddad LJ
  • iScience 2021[Jun]; 24 (6): 102646 PMID34056566show ga
  • The study objective was to the assess level of detectable severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies in the urban population of Qatar. Antibody testing was performed on residual blood specimens for 112,941 individuals ( approximately 10% of Qatar's urban population) attending for routine/other clinical care between May 12 and September 9, 2020. Seropositivity was 13.3% (95% confidence interval [CI] = 13.1-13.6%) and was independently associated with sex, age, nationality, clinical care encounter type, and testing date. Median optical density (antibody titer) among antibody-positive persons was 27.0 (range = 1.0-150.0), with higher values associated with age, nationality, clinical care encounter type, and testing date. Seropositivity by nationality was positively correlated with the likelihood of having higher antibody titers (Pearson correlation coefficient = 0.85; 95% CI = 0.47-0.96). Less than two in every 10 individuals in Qatar's urban population had detectable antibodies against SARS-CoV-2, suggesting this population is still far from herd immunity and at risk of subsequent infection waves. Higher antibody titer appears to be a biomarker of repeated exposures to the infection.
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