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  1. 1861
    “…Sera with a Plaque Reduction Neutralization Test(80) titer (PRNT(80)) ≥ 1:40 were considered responders with adequate titers for the purpose of biocontainment suite entry. …”
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    2773. Safety and Immunogenicity Study of Eastern Equine Encephalitis Vaccine
  2. 1862
    “…In the effusive form, antibody titers and protein electrophoresis in the effusions were analyzed. …”
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    Some aspects of humoral and cellular immunity in naturally occuring feline infectious peritonitis
  3. 1863
    “…Secondary outcomes included comparisons of IgG titers and identifying factors that were associated with seropositivity using univariate/multivariable analyses. …”
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    Evaluation of Seropositivity Following BNT162b2 Messenger RNA Vaccination for SARS-CoV-2 in Patients Undergoing Treatment for Cancer
  4. 1864
    “…Vaccinated study participants with detectable anti–NC–SARS-CoV-2 antibody titers (n = 30) developed generally higher anti-S1-RBD-SARS-CoV-2 antibody titers compared to anti–NC–SARS-CoV-2 negative individuals (n = 694) (median titer: 7812 vs. 345 BAU/ml, p < 0.0001). …”
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    Low SARS-CoV-2 infection rates and high vaccine-induced immunity among German healthcare workers at the end of the third wave of the COVID-19 pandemic
  5. 1865
    “…PURPOSE: The predictive value of antibody titers after the first SARS-CoV-2 vaccination and long-term trajectories of antibody titers in hemodialysis patients are unknown. …”
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    Long-term trajectories of SARS-CoV-2 neutralizing antibodies and predictive value of first dose vaccination-induced IgG-antibodies in hemodialysis patients
  6. 1866
    “…Four studies reported lower IgA salivary titers in vaccinated compared to previously infected individuals, otherwise, two reported higher titers of IgA in vaccinated. …”
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    Saliva is suitable for SARS-CoV-2 antibodies detection after vaccination: A rapid systematic review
  7. 1867
    “…Investigation of a dengue case in a laboratory worker in North Carolina, USA, revealed that the case-patient prepared high-titer dengue virus stocks soon before illness onset. …”
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    Laboratory-Acquired Dengue Virus Infection, United States, 2018
  8. 1868
    “…(b) During the fortnight succeeding a meal on infectious blood there occurred a reduction of titratable virus to not more than 1 per cent of that present in the freshly fed insects. (c) The titer was somewhat higher at later periods. This rise in titer signified possibly not a multiplication, but merely an increase of extracellular virus and of that easily freed by grinding to a titratable form. …”
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    THE TITRATION OF YELLOW FEVER VIRUS IN STEGOMYIA MOSQUITOES
  9. 1869
    “…The time of maximum reduction in complement titer invariably coincides with the time of complete antigen disappearance. …”
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    THE RELATIONSHIPS BETWEEN SERUM COMPLEMENT ACTIVITY AND THE DEVELOPMENT OF ALLERGIC LESIONS IN RABBITS
  10. 1870
    “…For dengue viruses 1 to 4 (DENV1-4), a specific range of antibody titer has been shown to enhance viral replication in vitro and severe disease in animal models. …”
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    Antibody-dependent enhancement of severe dengue disease in humans
  11. 1871
    “…To evaluate antigenic heterogeneity among these clusters, we compared antibody titers to each lineage virus using bovine sera collected over time following virus infection. …”
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    Antigenic heterogeneity among phylogenetic clusters of influenza D viruses
  12. 1872
    “…PrP(Sc) was detected both in and outside of nerve tissues, and some of the peripheral nerve tissues contained relatively high prion titers. Low titers of prions were also observed in masseter, jejunum, and adrenal glands. …”
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    Estimation of prion infectivity in tissues of cattle infected with atypical BSE by real time-quaking induced conversion assay
  13. 1873
    “…Immunotherapy with recombinant IFN-γ ameliorated disease as reflected by mortality rates and virus titers in target organs.…”
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    The role of gamma interferon in infection of susceptible mice with murine coronavirus, MHV-JHM
  14. 1874
    “…In addition to post-COVID-19 donors, the rapidly increasing number of COVID-19 vaccinated plasma donors now result in a mean antibody titer of >600 IU/mL already in July 2021 IG lots, with SARS-CoV-2 antibody titers for several lots even higher than earlier produced hyperimmune globulin products.…”
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    Plasma from post-COVID-19 and COVID-19-Vaccinated Donors Results in Highly Potent SARS-CoV-2 Neutralization by Intravenous Immunoglobulins
  15. 1875
    “…Based on the counting results, the titer of M13 phages can be calculated simply through mathematical substitution. …”
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    A new method for quantitative analysis of M13 bacteriophage by atomic force microscopy
  16. 1876
    “…Patients’ IgG titers were measured in cord blood and in infant blood at intervals up to 1 year of life; IgG and IgA titers were measured in maternal milk. …”
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    Assessment of Adverse Reactions, Antibody Patterns, and 12-month Outcomes in the Mother-Infant Dyad After COVID-19 mRNA Vaccination in Pregnancy
  17. 1877
    “…Re-vaccination of cattle at 120 days did improve protective titers but never reached the level of immunity of the first vaccination. …”
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    Evaluation of the effectiveness of foot-and-mouth disease vaccination of animals in the buffer zone of the Republic of Armenia in 2016–2020
  18. 1878
    “…Umbilical cord sera (n=10) titers were assessed at delivery. Titers were compared with those of pregnant women 4 to 12 weeks from the natural infection (n=37) by enzyme-linked immunosorbent assay. …”
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    Coronavirus disease 2019 vaccine response in pregnant and lactating women: a cohort study
  19. 1879
    “…Factors associated a significant increase in anti-TPO titer included worse baseline clinical severity (p=0.018), elevated C-reactive protein during hospitalization (p=0.033), and higher baseline anti-TPO titer (p=0.005). …”
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    Insights From Prospective Follow-up of Thyroid Function and Autoimmunity Among Covid-19 Survivors
  20. 1880
    “…SARS-CoV-2 S1-specific IgG antibody titers were measured using enzyme-linked immunosorbent assay (ELISA). …”
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    1467. Breakthrough Omicron Infections in Booster Vaccinated Healthcare Workers
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