scholarly journals Duration of antibody responses following severe acute respiratory syndrome coronavirus 2 infection

2022 ◽  
Author(s):  
Yao Jiang ◽  
Xiuqi Wei ◽  
Hui Wang ◽  
Guiling Li
Keyword(s):  
Risk Factors ◽  
Severe Acute Respiratory Syndrome ◽  
Short Duration ◽  
Immunoglobulin G ◽  
Symptom Onset ◽  
Patient Characteristics ◽  
Antibody Responses ◽  
Multivariable Logistic Regression Analysis ◽  
Igg Antibodies ◽  
Chi Square

Abstract Background Little is known on the duration of anti-severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immunoglobulin G (IgG) antibodies in patients following SARS-CoV-2 infection. Aims We aimed to determine the duration of the immunoglobulin G (IgG) and M (IgM) antibody responses following SARS-CoV-2 infection and to evaluate the risk factors for a short duration of anti-SARS-CoV-2 IgG. Methods We measured antibody responses in 94 patients who had recovered from SARS-CoV-2 infection. The chi-square test and multivariable logistic regression analysis were used to identify risk factors for a short duration (< 6 months) of anti-SARS-CoV-2 IgG. Results IgG antibodies were detectable in all patients until 4 months; 19 (21.8%) convalescent patients reverted to IgG negative 4–6 months after symptom onset. IgM antibodies decreased significantly to 5.7% at 4–6 months after symptom onset. Patient characteristics were not associated with a short duration of detectable IgG. Conclusions A substantial fraction of convalescents may exhibit a transient IgG response following SARS-CoV-2 infection. Our findings suggest that patients who have recovered from SARS-CoV-2 infection should also be vaccinated if their anti-SARS-CoV-2 IgG antibodies are undetectable.

scholarly journals Patient characteristics of smokers undergoing lumbar spine surgery: an analysis from the Quality Outcomes Database

2017 ◽  
Vol 27 (6) ◽  
pp. 661-669 ◽  
Author(s):  
Anthony L. Asher ◽  
Clinton J. Devin ◽  
Brandon McCutcheon ◽  
Silky Chotai ◽  
Kristin R. Archer ◽  
...  
Keyword(s):  
Risk Factors ◽  
Logistic Regression ◽  
Regression Analysis ◽  
Lumbar Spine ◽  
Smoking Status ◽  
Patient Characteristics ◽  
Lumbar Spine Surgery ◽  
Multivariable Logistic Regression Analysis ◽  
Insurance Status ◽  
Quality Outcomes

OBJECTIVEIn this analysis the authors compare the characteristics of smokers to nonsmokers using demographic, socioeconomic, and comorbidity variables. They also investigate which of these characteristics are most strongly associated with smoking status. Finally, the authors investigate whether the association between known patient risk factors and disability outcome is differentially modified by patient smoking status for those who have undergone surgery for lumbar degeneration.METHODSA total of 7547 patients undergoing degenerative lumbar surgery were entered into a prospective multicenter registry (Quality Outcomes Database [QOD]). A retrospective analysis of the prospectively collected data was conducted. Patients were dichotomized as smokers (current smokers) and nonsmokers. Multivariable logistic regression analysis fitted for patient smoking status and subsequent measurement of variable importance was performed to identify the strongest patient characteristics associated with smoking status. Multivariable linear regression models fitted for 12-month Oswestry Disability Index (ODI) scores in subsets of smokers and nonsmokers was performed to investigate whether differential effects of risk factors by smoking status might be present.RESULTSIn total, 18% (n = 1365) of patients were smokers and 82% (n = 6182) were nonsmokers. In a multivariable logistic regression analysis, the factors significantly associated with patients’ smoking status were sex (p < 0.0001), age (p < 0.0001), body mass index (p < 0.0001), educational status (p < 0.0001), insurance status (p < 0.001), and employment/occupation (p = 0.0024). Patients with diabetes had lowers odds of being a smoker (p = 0.0008), while patients with coronary artery disease had greater odds of being a smoker (p = 0.044). Patients’ propensity for smoking was also significantly associated with higher American Society of Anesthesiologists (ASA) class (p < 0.0001), anterior-alone surgical approach (p = 0.018), greater number of levels (p = 0.0246), decompression only (p = 0.0001), and higher baseline ODI score (p < 0.0001). In a multivariable proportional odds logistic regression model, the adjusted odds ratio of risk factors and direction of improvement in 12-month ODI scores remained similar between the subsets of smokers and nonsmokers.CONCLUSIONSUsing a large, national, multiinstitutional registry, the authors described the profile of patients who undergo lumbar spine surgery and its association with their smoking status. Compared with nonsmokers, smokers were younger, male, nondiabetic, nonobese patients presenting with leg pain more so than back pain, with higher ASA classes, higher disability, less education, more likely to be unemployed, and with Medicaid/uninsured insurance status. Smoking status did not affect the association between these risk factors and 12-month ODI outcome, suggesting that interventions for modifiable risk factors are equally efficacious between smokers and nonsmokers.

scholarly journals Long-term persistence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike protein-specific and neutralizing antibodies in recovered COVID-19 patients

2021 ◽  
Author(s):  
Jira Chansaenroj ◽  
Ritthideach Yorsaeng ◽  
Nasamon Wanlapakorn ◽  
Chintana Chirathaworn ◽  
Natthinee Sudhinaraset ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Symptom Onset ◽  
Neutralizing Antibodies ◽  
Serum Antibody ◽  
Neutralizing Antibody ◽  
Antibody Responses ◽  
Spike Protein ◽  
Immunological Study ◽  
Igg Antibody ◽  
Vaccine Schedule

Abstract Understanding antibody responses after natural severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection can guide the coronavirus disease 2019 (COVID-19) vaccine schedule. This study aimed to assess the dynamics of SARS-CoV-2 antibodies, including anti-spike protein 1 (S1) immunoglobulin (Ig)G, anti-receptor-binding domain (RBD) total Ig, anti-S1 IgA, and neutralizing antibody against wild-type SARS-CoV-2 in a cohort of patients who were previously infected with SARS-CoV-2. Between March and May 2020, 531 individuals with virologically confirmed cases of SARS-CoV-2 infection were enrolled in our immunological study. The neutralizing titers against SARS-CoV-2 were detected in 95.2%, 86.7%, 85.0%, and 85.4% of recovered COVID-19 patients at 3, 6, 9, and 12 months after symptom onset, respectively. The seropositivity rate of anti-S1 IgG, anti-RBD total Ig, anti-S1 IgA, and neutralizing titers remained at 68.6%, 89.6%, 77.1%, and 85.4%, respectively, at 12 months after symptom onset. The half-life of neutralizing titers was estimated at 100.7 days (95% confidence interval = 44.5 – 327.4 days, R2 = 0.106). These results support that the decline in serum antibody levels over time depends on the symptom severity, and the individuals with high IgG antibody titers experienced a significantly longer persistence of SARS-CoV-2-specific antibody responses than those with lower titers.

Incidence of Laryngotracheal Stenosis after Thermal Inhalation Airway Injury

2019 ◽  
Vol 40 (6) ◽  
pp. 961-965 ◽  
Author(s):  
Anne Sun Lowery ◽  
Greg Dion ◽  
Callie Thompson ◽  
Liza Weavind ◽  
Justin Shinn ◽  
...  
Keyword(s):  
Risk Factors ◽  
Burn Injury ◽  
Patient Characteristics ◽  
Inhalation Injury ◽  
Interquartile Range ◽  
Laryngotracheal Stenosis ◽  
Chi Square ◽  
Laryngeal Function ◽  
Airway Injury ◽  
Incidence Risk

Abstract Inhalation injury is independently associated with burn mortality, yet little information is available on the incidence, risk factors, or functional outcomes of thermal injury to the airway. In patients with thermal inhalation injury, we sought to define the incidence of laryngotracheal stenosis (LTS), delineate risk factors associated with LTS development, and assess long-term tracheostomy dependence as a proxy for laryngeal function. Retrospective cohort study of adult patients treated for thermal inhalation injury at a single institution burn critical care unit from 2012 to 2017. Eligible patients’ records were assessed for LTS (laryngeal, subglottic, or tracheal stenosis). Patient characteristics, burn injury characteristics, and treatment-specific covariates were assessed. Descriptive statistics, Mann–Whitney U-tests, odds ratio, and chi-square tests compared LTS versus non-LTS groups. Of 129 patients with thermal inhalation injury during the study period, 8 (6.2%) developed LTS. When compared with the non-LTS group, patients with LTS had greater mean TBSA (mean 30.3, Interquartile Range 7–57.5 vs 10.5, Interquartile Range 0–15.12, P = .01), higher grade of inhalation injury (mean 2.63 vs 1.80, P = .05), longer duration of intubation (12.63 vs 5.44; P &lt; .001), and greater inflammatory response (mean white blood cell count on presentation 25.8 vs 14.9, P = .02, mean hyperglycemia on presentation 176.4 vs 136.9, P = .01). LTS patients had a significantly higher rate of tracheostomy dependence at last follow-up (50 vs 1.7%, P &lt; .001). Six percent of patients with thermal inhalation injury develop LTS. LTS was associated with more severe thermal airway injury, longer duration of intubation, and more severe initial host inflammation. Patients with inhalation injury and LTS are at high risk for tracheostomy dependence. In burn patients with thermal inhalation injury, laryngeal evaluation and directed therapy should be incorporated early into multispecialty pathways of care.

scholarly journals Profile of Immunoglobulin G and IgM Antibodies Against Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)

2020 ◽  
Vol 71 (16) ◽  
pp. 2255-2258 ◽  
Author(s):  
Jiuxin Qu ◽  
Chi Wu ◽  
Xiaoyong Li ◽  
Guobin Zhang ◽  
Zhaofang Jiang ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Immunoglobulin G ◽  
Antibody Responses ◽  
Illness Onset ◽  
N Protein ◽  
Igm Antibodies ◽  
Critical Patients

Abstract We profiled the serological responses to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nucleocapsid (N) protein and spike (S) glycoprotein. The majority of the patients developed robust antibody responses between 17 and 23 days after illness onset. Delayed, but stronger, antibody responses were observed in critical patients.

scholarly journals Enhanced SARS-CoV-2 neutralization by dimeric IgA

2020 ◽  
pp. eabf1555 ◽  
Author(s):  
Zijun Wang ◽  
Julio C. C. Lorenzi ◽  
Frauke Muecksch ◽  
Shlomo Finkin ◽  
Charlotte Viant ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Progenitor Cells ◽  
Neutralizing Antibody ◽  
Antibody Responses ◽  
Igg Antibodies ◽  
Viral Spread ◽  
Mucosal Surfaces ◽  
Iga Response ◽  
Secretory Antibodies ◽  
Primary Form

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 (COVID-19), primarily infects cells at mucosal surfaces. Serum neutralizing antibody responses are variable and generally low in individuals that suffer mild forms of COVID-19. Although potent IgG antibodies can neutralize the virus, less is known about secretory antibodies such as IgA that might impact the initial viral spread and transmissibility from the mucosa. Here we characterize the IgA response to SARS-CoV-2 in a cohort of 149 convalescent individuals following diagnosis with COVID-19. IgA responses in plasma generally correlated with IgG responses. Further, clones of IgM-, IgG-, and IgA-producing B cells were derived from common progenitor cells. Plasma IgA monomers specific to SARS-CoV-2 proteins were demonstrated to be two-fold less potent than IgG equivalents. However, IgA dimers, the primary form of antibody in the nasopharynx, were on average fifteen times more potent than IgA monomers against the same target. Thus, dimeric IgA responses may be particularly valuable for protection against SARS-CoV-2 and for vaccine efficacy.

scholarly journals Antibody response and viraemia during the course of severe acute respiratory syndrome (SARS)-associated coronavirus infection

2004 ◽  
Vol 53 (5) ◽  
pp. 435-438 ◽  
Author(s):  
Weijun Chen ◽  
Zuyuan Xu ◽  
Jingsong Mu ◽  
Ling Yang ◽  
Haixue Gan ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Antibody Response ◽  
Time Course ◽  
Recovery Phase ◽  
Antibody Responses ◽  
Igg Antibodies ◽  
Rt Pcr ◽  
Blood Samples ◽  
Convalescent Phase ◽  
Coronavirus Infection

To understand the time-course of viraemia and antibody responses to severe acute respiratory syndrome-associated coronavirus (SARS-CoV), RT-PCR and ELISA were used to assay 376 blood samples from 135 SARS patients at various stages of the illness, including samples from patients who were in their early convalescent phase. The results showed that IgM antibodies decreased and became undetectable 11 weeks into the recovery phase. IgG antibodies, however, remained detectable for a period beyond 11 weeks and were found in 100 % of patients in the early convalescent phase. SARS-CoV viraemia mainly appeared 1 week after the onset of illness and then decreased over a period of 1 month, becoming undetectable in the blood samples of the convalescent patients. At the peak of viraemia, viral RNA was detectable in 75 % of blood samples from patients who were clinically diagnosed with SARS 1 or 2 weeks before the test.

scholarly journals First report on seroprevalence and risk factors of Toxoplasma gondii infection in sheep and goats in North Lebanon

2019 ◽  
Vol 13 (09) ◽  
pp. 831-836 ◽  
Author(s):  
Dima El Safadi ◽  
Dany Abi Chahine ◽  
Alissar Al Tarraf ◽  
Omar Raii ◽  
Karim Mesto ◽  
...  
Keyword(s):  
Risk Factors ◽  
Risk Factor ◽  
Toxoplasma Gondii ◽  
Immunoglobulin G ◽  
Agglutination Test ◽  
Economic Losses ◽  
Transplacental Transmission ◽  
Igg Antibodies ◽  
Modified Agglutination Test ◽  
Toxoplasma Gondii Infection

Introduction: Toxoplasmosis is of dual importance in both public and veterinary health due to the respective risk of transplacental transmission in primo-infected pregnant women and economic losses caused by abortions in mammals. One of the main routes of Toxoplasma gondii transmission to humans is the consumption of raw or undercooked meats containing parasitic cysts. Here, we performed the first epidemiological study to determine the seroprevalence and the risk factors of toxoplasmosis in livestock in Lebanon. Methodology: Using a modified agglutination test with a cut-off of 1:40, we tested the positivity rate of Immunoglobulin G antibodies in the sera of 100 sheep and 80 goats collected from 18 different livestock farms located in North Lebanon between March and June 2018. Results: Anti-Toxoplasma gondii IgG antibodies were detected in 42% of sheep and 34% of goats. Adults (> 1 year) were significantly more infected by T. gondii than the lambs (< 1 year) in both species (p < 0.05). Conclusions: These findings indicated that food animals are highly exposed to T. gondii in Lebanon and could be potentially a major risk factor of T. gondii infection to humans. Consequently, national prophylactic strategies should be implemented to control and to prevent T. gondii transmission between animals and humans.

scholarly journals Prevalence of Immunoglobulin G (IgG) Against Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) and Evaluation of a Rapid MEDsan IgG Test in Children Seeking Medical Care

2020 ◽  
Author(s):  
Klara M Posfay-Barbe ◽  
Diego O Andrey ◽  
Julien Virzi ◽  
Patrick Cohen ◽  
Fiona Pigny ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Medical Care ◽  
Diagnostic Test ◽  
Rapid Diagnostic Test ◽  
Infection Rate ◽  
Immunoglobulin G ◽  
Gold Standard ◽  
Igg Antibodies ◽  
Rt Pcr ◽  
Seropositivity Rate

Abstract In 208 children seeking medical care, the seropositivity rate of anti–SARS-CoV-2 IgG antibodies was 8.7%, suggesting an infection rate similar to that observed in adults but &gt;100-fold the incidence of RT-PCR–confirmed pediatric cases. Compared with the gold-standard combined ELISA + immunofluorescence, the MEDsan IgG rapid diagnostic test performed accurately.

Risk Factors of Composite Attachment Loss During Orthodontic Clear Aligner Therapy

2020 ◽  
Author(s):  
Yaosen Chen ◽  
Mohamed AM ◽  
WANG Jinbo ◽  
ZHENG Ziwei ◽  
Maher Al-balaa ◽  
...  
Keyword(s):  
Risk Factors ◽  
Daily Practice ◽  
Multivariable Logistic Regression Analysis ◽  
Chi Square ◽  
Attachment Loss ◽  
Wear Time ◽  
Related Risk ◽  
Potential Risk Factors ◽  
Chi Square Test ◽  
Clear Aligner

Abstract Background The composite attachment loss during orthodontic clear aligner therapy is an adverse event that commonly happens in our daily practice. However, there is a lack of related statistical analysis, and studies analyzing the related risk factors. Therefore, the aim of this study is to assess the incidence of attachment loss during orthodontic clear aligner therapy and to identify rick factors that may predict such event.Methods The demographics and clinical variables of 94 patients undergoing clear aligner therapy (27 males and 67 females; average age: 27.60± 0.86 years) were recorded. Both patient-related and tooth-related attachment loss was recorded. The chi-square test and logistic regressive analysis were applied to identify the potential risk factors. SPSS for Mac (version 23.0, IBM, USA) was used for statistical analyses. P＜0.05 was considered statistically significant. Results Our study suggested that the risk factors for attachment loss include: frequent aligner removal (>= 5 times a day) (losing rate=60.0%, P=0.005); aligner wear time less than 18 hours a day (losing rate=50.8%, P=0.014); eating without aligners inserted (losing rate=47.9%, P=0.034); utilizing aligner tray seaters (losing rate=48.2%, P=0.006) and unilateral mastication (losing rate=52.1%, P=0.002). The multivariable logistic regression analysis indicates that aligner wear time less than 18 hours a day (P=0.020, B=0.925), using aligner tray seaters (P=0.007, B=1.168) and unilateral mastication (P=0.034, B=-0.458) were considered independent factors that can predict the composite attachment loss in orthodontic clear aligner therapy.Conclusion Wearing aligner less than 18 hours a day, using aligner tray seaters and unilateral mastication may contribute to increased incidence of composite attachment loss during orthodontic clear aligner therapy.

scholarly journals Anticorpos anti-toxoplasma gondii em gatos domiciliados no Município de Rio Branco, Acre, Brasil

2015 ◽  
Vol 36 (6) ◽  
pp. 3757 ◽  
Author(s):  
Soraia Figueiredo de Souza ◽  
Luciana Dos Santos Medeiros ◽  
Adriane De Souza Belfort ◽  
Andrey Luiz Lopes Cordeiro ◽  
Michelle Federle ◽  
...  
Keyword(s):  
Risk Factors ◽  
Toxoplasma Gondii ◽  
Significant Risk ◽  
Igg Antibodies ◽  
Domestic Cats ◽  
Chi Square ◽  
Significance Level ◽  
Chi Square Test ◽  
One Year ◽  
Toxoplasma Gondii Infection

Blood samples were collected from 89 cats to assess the prevalence of IgG antibodies against Toxoplasma gondii by indirect immunofluorescence (IIF) and the possible risk factors associated with feline Toxoplasma gondii infection. An epidemiological questionnaire was developed and implemented for owners of domestic cats domiciled in Rio Branco, Acre. The results were statistically evaluated with the odds ratio and chi-square tests, considering the significance level of 5%. Of 89 animals’ samples, 22 had antibodies against Toxoplasma gondii. Among the 22 reactive animals, 15 (68.19%) were female, 15 (68.19%) were less than one year old and 20 (90%) were cross breed. Concerning risk factors, there was no difference (p > 0.05) between the variables evaluated by the chi-square test. Moreover, 16 (72%) cats were fed a mixed diet, 20 (90%) of the cats had hunting habits, 18 (81%) had contact with animals of another species, 11 (50%) had access to the street, and 22 (95%) lived in homes that had areas of grass or dirt. In conclusion, the prevalence of anti-Toxoplasma gondii in domestic cats was 22.7%, and there were no significant risk factors for feline toxoplasmosis in the municipality of Rio Branco, Acre.

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