Analysis of immunoglobulin isotype levels in acute pneumococcal bacteremia and in convalescence

1994 ◽  
Vol 13 (5) ◽  
pp. 374-378 ◽  
Author(s):  
K. Ekdahl ◽  
J. Rollof ◽  
V. A. Oxelius ◽  
J. Engellau ◽  
J. H. Braconier
Keyword(s):  
Immunoglobulin Isotype ◽  
Pneumococcal Bacteremia

Occult Pneumococcal Bacteremia

2010 ◽  
Vol 26 (6) ◽  
pp. 448-454 ◽  
Author(s):  
Mark D. Joffe ◽  
Elizabeth R. Alpern
Keyword(s):  
Pneumococcal Bacteremia

Prevalence of Penicillin-Nonsusceptible Pneumococcal Bacteremia in a Staten Island Community Hospital

2000 ◽  
Vol 93 (11) ◽  
pp. 1078-1080 ◽  
Author(s):  
CALOGERA PERRONE ◽  
PAOLO PERRONE ◽  
VIRGINIA KOPETZ ◽  
DEEPTHA NEDUNCHEZIAN ◽  
ROBERT LEGGIADRO
Keyword(s):  
Community Hospital ◽  
Staten Island ◽  
Pneumococcal Bacteremia ◽  
Island Community

Outcome of Patients With Pneumococcal Bacteremia at Mulago Hospital, Kampala

2009 ◽  
Vol 17 (4) ◽  
pp. 248-252
Author(s):  
Grace Antoinette Namayanja-Kaye ◽  
Alice Namale ◽  
Moses L. Joloba ◽  
Robert A. Salata
Keyword(s):  
Mulago Hospital ◽  
Pneumococcal Bacteremia

scholarly journals 1002. Epidemiology of Pneumococcal Bacteremia in a Large Tertiary Center

2018 ◽  
Vol 5 (suppl_1) ◽  
pp. S298-S298
Author(s):  
Aristotle Asis ◽  
Esmeralda Gutierrez-Asis ◽  
Ali Hassoun
Keyword(s):  
Mechanical Ventilation ◽  
Hospital Stay ◽  
The United States ◽  
Morbidity And Mortality ◽  
Hospital Length Of Stay ◽  
Smoking History ◽  
High Morbidity ◽  
Icu Stay ◽  
Pneumococcal Bacteremia ◽  
Tertiary Center

Abstract Background Streptococcus pneumoniae remains an important cause of bacteremia in the United States with high morbidity and mortality despite readily available treatment and vaccines. Increased incidence of bacteremia observed during 2017–2018 season. Methods Retrospective chart review of patients admitted with pneumococcal bacteremia over the last two winter seasons. Demographics, laboratory data, ICU stay, need for ventilation or pressor, comorbidities, and mortality were collected. Results Fifty-three patients enrolled. 62% admitted during 2017–2018. Sixty-six percent white, 60% male, mean BMI 27 (38% had normal BMI). Mean age was 55 years (1–93) (57% > 61). Mean hospital length of stay was 7.8 days (1–30). More than 40% required ICU stay. The use of NPPV, vasopressors, and mechanical ventilation were 6%, 15%, and 17%, respectively. Most common presentation: dyspnea 30% and fever 18%. Smoking history (55%). Eighty percent of these patients had pneumonia. Resistance to penicillin 9% and intermediate susceptibility 6%. Resistance to erythromycin 44% and trimethoprim-sulfamethoxazole 12% which increased during winter 2017 (52% and 12%) compared with winter 2016 (30% and 10%). Only 2% of patients with pneumonia had positive sputum culture for pneumococcus and 62% had positive serum pneumococcal antigen with bacteremia. Positive co-detection of bacterial or viral targets in sputum using Multiplex PCR did not correlate with mortality and hospital stay but they were more likely needed ICU stay, use of vasopressor and mechanical ventilation. 43% of empiric therapy was as recommended by IDSA guidelines. Comparing 2016 vs. 2017 seasons, mortality (15% vs. 6%), hospital stay (9 days vs. 7 days), use of NPPV (5% vs. 6%) mechanical ventilation (15% vs. 18%) and vasopressor (5% vs. 21%). No correlation between influenza infection and bacteremia. Overall 6-month mortality and re-admission rate was 9% and 2%, respectively. Mortality was higher in overweight patients (60% vs. 20%), non-smokers (40% vs. 20%), coronary artery disease (40%) and congestive heart failure (40%). Conclusion Pneumococcal bacteremia cause significant morbidity and mortality, we observed less mortality and hospital stay, but more use of NPPV, mechanical ventilation, and vasopressor during 2017–2018 season which had widespread influenza like activity. Disclosures All authors: No reported disclosures.

scholarly journals Impact of Immunoglobulin Isotype and Epitope on the Functional Properties of Vibrio cholerae O-Specific Polysaccharide-Specific Monoclonal Antibodies

mBio ◽  
2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Robert C. Kauffman ◽  
Oluwaseyi Adekunle ◽  
Hanyi Yu ◽  
Alice Cho ◽  
Lindsay E. Nyhoff ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Functional Properties ◽  
Diarrheal Disease ◽  
Cross Linking ◽  
Specific Antibodies ◽  
Immunoglobulin Isotype ◽  
High Affinity ◽  
O Antigen ◽  
The Impact ◽  
Motility Inhibition

ABSTRACT Vibrio cholerae causes the severe diarrheal disease cholera. Clinical disease and current oral cholera vaccines generate antibody responses associated with protection. Immunity is thought to be largely mediated by lipopolysaccharide (LPS)-specific antibodies, primarily targeting the O-antigen. However, the properties and protective mechanism of functionally relevant antibodies have not been well defined. We previously reported on the early B cell response to cholera in a cohort of Bangladeshi patients, from which we characterized a panel of human monoclonal antibodies (MAbs) isolated from acutely induced plasmablasts. All antibodies in that previous study were expressed in an IgG1 backbone irrespective of their original isotype. To clearly determine the impact of affinity, immunoglobulin isotype and subclass on the functional properties of these MAbs, we re-engineered a subset of low- and high-affinity antibodies in different isotype and subclass immunoglobulin backbones and characterized the impact of these changes on binding, vibriocidal, agglutination, and motility inhibition activity. While the high-affinity antibodies bound similarly to O-antigen, irrespective of isotype, the low-affinity antibodies displayed significant avidity differences. Interestingly, despite exhibiting lower binding properties, variants derived from the low-affinity MAbs had comparable agglutination and motility inhibition properties to the potently binding antibodies, suggesting that how the MAb binds to the O-antigen may be critical to function. In addition, not only pentameric IgM and dimeric IgA, but also monomeric IgA, was remarkably more potent than their IgG counterparts at inhibiting motility. Finally, analyzing highly purified F(ab) versions of these antibodies, we show that LPS cross-linking is essential for motility inhibition. IMPORTANCE Immunity to the severe diarrheal disease cholera is largely mediated by lipopolysaccharide (LPS)-specific antibodies. However, the properties and protective mechanisms of functionally relevant antibodies have not been well defined. Here, we have engineered low and high-affinity LPS-specific antibodies in different immunoglobulin backbones in order to assess the impact of affinity, immunoglobulin isotype, and subclass on binding, vibriocidal, agglutination, and motility inhibition functional properties. Importantly, we found that affinity did not directly dictate functional potency since variants derived from the low-affinity MAbs had comparable agglutination and motility inhibition properties to the potently binding antibodies. This suggests that how the antibody binds sterically may be critical to function. In addition, not only pentameric IgM and dimeric IgA, but also monomeric IgA, was remarkably more potent than their IgG counterparts at inhibiting motility. Finally, analyzing highly purified F(ab) versions of these antibodies, we show that LPS cross-linking is essential for motility inhibition.

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