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  1. 2261
    “…The virus was excreted in feces for only 3 days at high titers and then intermittently at low titers. However, viral antigen was detected in crypt or Peyer's patches for at least 3 weeks after infection in 1 of 3 calves given virulent virus and 1 of 2 calves given attenuated virus.…”
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    Excretion and persistence of bovine coronavirus in neonatal calves
  2. 2262
    “…The patient's high-titer vaccine viremia and possibly related minor genetic anomalies provide clues to exploring the etiology of YEL-AVD.…”
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    Fatal multiorgan failure due to yellow fever vaccine-associated viscerotropic disease
  3. 2263
    “…At pH 6, the total ester titer improved by 2.5-fold, with SSL76 producing 225 mg/L of ethyl acetate, and 18.2 mg/L of ethyl lactate, the highest reported titer in E. coli. …”
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    Unravelling the hidden power of esterases for biomanufacturing of short-chain esters
  4. 2264
    “…Serological tests showed a seroconversion in antibody titers to F. tularensis (IgG titer = 400) and Legionella pneumophila (IgG titer = 512). …”
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    Pericardial effusion as the only manifestation of infection with Francisella tularensis: a case report
  5. 2265
    “…Studies have shown that heterologous neutralizing antibody titers are inversely correlated with severity of a second infection. …”
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    Neutralizing Antibodies after Infection with Dengue 1 Virus
  6. 2266
    “…In March 2008, seven of these horses had a subsequent 4-fold rise in JEV antibody titers while this titer decreased in nine animals. …”
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    Serosurveillance for Japanese encephalitis virus infection among equines in India
  7. 2267
    “…During March 22–April 6, 2011, we interviewed 2,622 residents ≥ 2 years of age and tested serum specimens from 2,527 (96%) participants for vibriocidal and antibodies against cholera toxin; 18% of participants reported a cholera diagnosis, 39% had vibriocidal titers ≥ 320, and 64% had vibriocidal titers ≥ 80, suggesting widespread infection. …”
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    Seroepidemiologic Survey of Epidemic Cholera in Haiti to Assess Spectrum of Illness and Risk Factors for Severe Disease
  8. 2268
    “…BLV infection was detected by measuring serum antibody titer against BLV virus antigen (gp51). The anti-BLV antibody titers of the BLV-infected cows were significantly higher in serum than in milk; a single serum-positive animal lacked detectable anti-BLV antibodies in its milk. …”
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    Iron and Ferritin Levels in the Serum and Milk of Bovine Leukemia Virus-Infected Dairy Cows
  9. 2269
    “…Antibody titers raised for vaccinations against avian influenza (AI) and Newcastle disease (ND) were higher in Chinese Beijing-You (BJY) than in White Leghorn (WL) (P < 0.001), but there was no breed difference in titers for sheep red blood cells (SRBC). …”
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    Association of SNPs in exon 2 of the MHC B-F gene with immune traits in two distinct chicken populations: Chinese Beijing-You and White Leghorn
  10. 2270
    “…Of the 443 tested samples, 12 (2.7%) had a reactive ELISA result, and 9 of the 12 had reactive indirect fluorescent antibody and microneutralization assay titers. Undertaking clinical trials of convalescent plasma for passive immunotherapy of MERS-CoV infection may be feasible, but such trials would be challenging because of the small pool of potential donors with sufficiently high antibody titers. …”
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    Feasibility of Using Convalescent Plasma Immunotherapy for MERS-CoV Infection, Saudi Arabia
  11. 2271
    “…Protection was associated with HAI titers against an A(H1N1)pdm09 strain possessing the K166Q mutation but not with HAI titers against the current A(H1N1)pdm09 vaccine strain, which lacks this mutation. …”
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    Antibodies Against the Current Influenza A(H1N1) Vaccine Strain Do Not Protect Some Individuals From Infection With Contemporary Circulating Influenza A(H1N1) Virus Strains
  12. 2272
    por Findlow, Jamie, Balmer, Paul, Borrow, Ray
    Publicado 2019
    “…Use of baby rabbit complement (rSBA assays), per standard guidelines for serogroups A and C, generally results in comparatively higher titers. Postlicensure effectiveness data for serogroup C conjugate vaccines support acceptance of rSBA titers ≥8 as the correlate of protection for this serogroup, but no thresholds have been formally established for serogroups A, W, and Y. …”
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    A review of complement sources used in serum bactericidal assays for evaluating immune responses to meningococcal ACWY conjugate vaccines
  13. 2273
    “…In addition, antibody titers were similar when mouse hepatitis virus (MHV)-infected cells were used as the source of antigen for the IFA technique. …”
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    A comparison of the sensitivity and specificity of sialodacryoadenitis virus, Parker's rat coronavirus, and mouse hepatitis virus-infected cells as a source of antigen for the detection of antibody to rat coronaviruses
  14. 2274
    por Piccoli, Luca, Park, Young-Jun, Tortorici, M. Alejandra, Czudnochowski, Nadine, Walls, Alexandra C., Beltramello, Martina, Silacci-Fregni, Chiara, Pinto, Dora, Rosen, Laura E., Bowen, John E., Acton, Oliver J., Jaconi, Stefano, Guarino, Barbara, Minola, Andrea, Zatta, Fabrizia, Sprugasci, Nicole, Bassi, Jessica, Peter, Alessia, De Marco, Anna, Nix, Jay C., Mele, Federico, Jovic, Sandra, Rodriguez, Blanca Fernandez, Gupta, Sneha V., Jin, Feng, Piumatti, Giovanni, Lo Presti, Giorgia, Pellanda, Alessandra Franzetti, Biggiogero, Maira, Tarkowski, Maciej, Pizzuto, Matteo S., Cameroni, Elisabetta, Havenar-Daughton, Colin, Smithey, Megan, Hong, David, Lepori, Valentino, Albanese, Emiliano, Ceschi, Alessandro, Bernasconi, Enos, Elzi, Luigia, Ferrari, Paolo, Garzoni, Christian, Riva, Agostino, Snell, Gyorgy, Sallusto, Federica, Fink, Katja, Virgin, Herbert W., Lanzavecchia, Antonio, Corti, Davide, Veesler, David
    Publicado 2020
    “…Whereas overall RBD-specific serum IgG titers waned with a half-life of 49 days, nAb titers and avidity increased over time for some individuals, consistent with affinity maturation. …”
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    Mapping Neutralizing and Immunodominant Sites on the SARS-CoV-2 Spike Receptor-Binding Domain by Structure-Guided High-Resolution Serology
  15. 2275
    “…Endpoints included serum vibriocidal antibody (SVA) seroconversion, defined as a 4-fold or greater rise in antibody titer over baseline; geometric mean titers (GMTs); and geometric mean fold increase (GMFI) over baseline. …”
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    Long-Term Immunogenicity of Live Oral Cholera Vaccine CVD 103-HgR in Adolescents Aged 12–17 Years in the United States
  16. 2276
    “…Finally, increasing or replacing the carbon source of the culture medium resulted in a final spinosad titer of ∼70 mg/L, which is the highest titer of spinosad achieved in heterologous Streptomyces species. …”
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    Increasing the heterologous production of spinosad in Streptomyces albus J1074 by regulating biosynthesis of its polyketide skeleton
  17. 2277
    “…Here, we use a live virus neutralization assay with sera from Pfizer- and Moderna-vaccinated individuals to examine neutralizing antibody titers against SARS-CoV-2 and observe a 3.9- and 2.7-fold reduction, respectively, in neutralizing antibody titers against the Delta variant compared with an early isolate bearing only a D614G substitution in its spike protein. …”
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    Long-term, infection-acquired immunity against the SARS-CoV-2 Delta variant in a hamster model
  18. 2278
    “…Prior to Omicron infection, the patient had strong neutralizing antibody titers against the vaccine strain, but no neutralization of Omicron. …”
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    Immune Response to SARS-CoV-2 Vaccine and Following Breakthrough Omicron Infection in an Autoimmune Patient with Hashimoto’s Thyroiditis, Pernicious Anemia, and Chronic Atrophic Autoimmune Gastritis: A Case Report
  19. 2279
    “…After the second dose, 234 participants had their anti-S-RBD antibody titers decrease over time. We also showed the booster dose (the third dose) increased antibody titer by average 14 (min–max, 2–255)-fold higher compared to the second dose among the 211-booster group participants, therefore, the booster dose could be recommended for low responders to the second dose. …”
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    Strong SARS-CoV-2 Antibody Response After Booster Dose of BNT162b2 mRNA Vaccines in Uninfected Healthcare Workers
  20. 2280
    “…High frequencies of multiple activated cell types during acute infection are associated with high titers of ZIKV neutralizing antibodies 6 months post-infection, while stable immune features suggesting a cytotoxic-skewed immune set point are associated with low titers. …”
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    A cytotoxic-skewed immune set point predicts low neutralizing antibody levels after Zika virus infection
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