scholarly journals Antibody Response amongst Nucleic Acid Amplification Test (Naat) Confirmed Covid-19 Positive Patients: A Cross Sectional Study

2021 ◽  
Vol 39 ◽  
pp. S74
Author(s):  
Gurpreet Singh Bhalla ◽  
Rajat Shukla ◽  
Kuntal Bandyopadhyay ◽  
Rachana Warrier
Keyword(s):  
Nucleic Acid ◽  
Antibody Response ◽  
Cross Sectional Study ◽  
Nucleic Acid Amplification Test ◽  
Nucleic Acid Amplification ◽  
Sectional Study ◽  
Cross Sectional

scholarly journals A Retrospective Cross-Sectional Study of the Utility of Cartridge-Based Nucleic Acid Amplification Test in Diagnosis of Pulmonary and Extrapulmonary Tuberculosis in People Living with HIV in Second Highest HIV Prevalent State in India

2021 ◽  
Author(s):  
Tade Bagbi ◽  
Ningthoukhongjam Reema ◽  
S. Bhagyabati Devi ◽  
Thangjam Gautam Singh ◽  
Mohammad Jaleel ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Cross Sectional Study ◽  
Nucleic Acid Amplification Test ◽  
Nucleic Acid Amplification ◽  
Rifampicin Resistance ◽  
Sputum Smear ◽  
Smear Microscopy ◽  
Sectional Study ◽  
Cross Sectional ◽  
Smear Negative

Abstract Introduction Tuberculosis (TB) in people living with human immunodeficiency virus (PLHIV) is difficult to diagnose due to fewer organisms in sputum and extrapulmonary samples. Sputum culture takes 4 to 8 weeks for growth of the mycobacteria. Delayed treatment for TB in PLHIV leads to increased mortality. This study evaluated cartridge-based nucleic acid amplification test (CBNAAT) as a diagnostic tool for diagnosis of pulmonary TB (PTB) and extrapulmonary TB (EPTB) in PLHIV in the second most HIV prevalent state in India and for comparing its efficacy between Ziehl–Neelsen (ZN) staining sputum smear–positive and sputum smear–negative TB. Methods This cross-sectional study was conducted in RIMS, Imphal, with 167 PLHIV patients, age 15 years or older, having signs and symptoms of TB. Appropriate samples for sputum microscopy and CBNAAT were sent. Conclusion The overall sensitivity of sputum smear for acid-fast bacillus (AFB) was found to be 30.71% and that of CBNAAT was 38.57%. Sensitivity of CBNAAT for sputum smear–positive and sputum smear–negative TB was 100 and 11.3%, respectively. Sensitivity of ZN smear for AFB of EPTB sample was 48.1% and that of CBNAAT was 59.25%. In both PTB and EPTB, CBNAAT showed an increase in diagnosis of microbiologically confirmed PTB cases by 7.8 and 11.1%, respectively, over and above the cases diagnosed by ZN smear microscopy. Rifampicin resistance was detected in five patients. We conclude that CBNAAT is a rapid test with better sensitivity in diagnosis of PTB and EPTB in PLHIV, compared with ZN smear microscopy. It detects rifampicin resistance for multidrug-resistant TB and helps in early treatment intervention.

Changing Clinicoradiologic Spectrum of Intracranial Neurotuberculosis in Children: A Cross-sectional Study

2020 ◽  
Vol 35 (13) ◽  
pp. 879-888
Author(s):  
Sumiti Banga ◽  
Chandrika Azad ◽  
Rekha Gupta ◽  
Nishit Sawal ◽  
Vidushi Mahajan ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Care Center ◽  
Tertiary Care ◽  
Cross Sectional Study ◽  
Nucleic Acid Amplification Test ◽  
Nucleic Acid Amplification ◽  
Gastric Aspirate ◽  
Sectional Study ◽  
Tubercular Meningitis ◽  
Cross Sectional

Background: Neurotuberculosis is among the most severe type of tuberculosis with high mortality and morbidity in all age groups. Various sociodemographic and disease-/treatment-related factors have emerged over the years that can affect clinical and radiologic features of neurotuberculosis. Objective: To investigate various clinical and neuroradiologic presentations of neurotuberculosis. Methodology: This cross-sectional study was done in a tertiary care center of northern India. The patients between the ages of 3 months and 18 years with newly diagnosed neurotuberculosis were enrolled after taking informed consent. Results: A total of 78 patients (37% males) were enrolled. Fifty-six patients (72%) had tubercular meningitis (TBM) and 22 (28%) isolated tuberculomas. Very high percentage of patients in both the groups was BCG vaccinated. In the tubercular meningitis group, fever (68%), headache (59%), and vomiting (54%) were the most common complaints whereas in the tuberculoma group, seizures (95.5%) were the main complaint and systemic symptoms were rare. In tubercular meningitis patients, cerebrospinal fluid–based studies showed cartridge-based nucleic acid amplification test (Xpert MTB/RIF) positivity for Mycobacterium tuberculosis in 17.6% cases, whereas on gastric aspirate and sputum examination, acid-fast bacilli were seen in 30.7% and cartridge-based nucleic acid amplification test was positive in 19% patients. On neuroimaging, hydrocephalus was seen in 44.6% of tubercular meningitis patients, infarcts in 32%, and basal exudates in 12% patients only; coexistent tuberculomas were seen in 53%. Conclusion: Compared with the available literature, the present study showed a smaller percentage of children <5 years of age, stage III tubercular meningitis cases, and typical neuroradiologic findings like hydrocephalus and basal exudates and more tuberculomas associated with tubercular meningitis.

West Nile Virus Chorioretinitis in the Presence of Negative Cerebrospinal Fluid Polymerase Chain Reaction Results

2021 ◽  
pp. 247412642097925
Author(s):  
Kareem Moussa ◽  
Karen W. Jeng-Miller ◽  
Leo A. Kim ◽  
Dean Eliott
Keyword(s):  
Cerebrospinal Fluid ◽  
West Nile Virus ◽  
Cross Sectional Study ◽  
Nucleic Acid Amplification ◽  
Sectional Study ◽  
Chain Reaction ◽  
West Nile ◽  
Cross Sectional ◽  
Positive Serum ◽  
Polymerase Chain

Purpose: This work aims to evaluate the utility of nucleic acid amplification testing (NAAT) and serology in confirming West Nile Virus (WNV) infection in patients with suspected WNV chorioretinitis. Methods: A retrospective cross-sectional study was conducted of a cluster of patients who presented to the Retina Service of Massachusetts Eye and Ear between September and October 2018. Results: Three patients were identified with classic WNV chorioretinitis lesions with negative cerebrospinal fluid NAAT and positive serum serology findings. The diagnosis of WNV chorioretinitis was made based on the appearance of the fundus lesions and the presence of characteristic findings on fluorescein angiography as previously described in the literature. Conclusions: This report highlights 3 unique cases of WNV chorioretinitis in which NAAT of cerebrospinal fluid failed to identify WNV as the inciting agent. These cases stress the importance of serum serologic testing in diagnosing WNV infection.

scholarly journals Discordant Clostridioides difficile diagnostic assay and treatment practice: a cross-sectional study in a tertiary care hospital, Geneva, Switzerland

BMJ Open ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. e036342
Author(s):  
Lauriane Lenggenhager ◽  
Marie-Céline Zanella ◽  
Antoine Poncet ◽  
Laurent Kaiser ◽  
Jacques Schrenzel
Keyword(s):  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Cross Sectional Study ◽  
Nucleic Acid Amplification ◽  
Care Hospital ◽  
Diagnostic Assay ◽  
Sectional Study ◽  
Cross Sectional ◽  
Treatment Practice ◽  
Clostridioides Difficile

ObjectivesTo determine the proportion of patients who received a treatment for Clostridioides difficile infection (CDI) among those presenting a discordant C. difficile diagnostic assay and to identify patient characteristics associated with the decision to treat CDI.DesignCross-sectional study.SettingMonocentric study in a tertiary care hospital, Geneva, Switzerland.ParticipantsAmong 4562 adult patients tested for C. difficile between March 2017 and March 2019, 208 patients with discordant tests’ results (positive nucleic acid amplification test (NAAT+)/negative enzyme immunoassay (EIA−)) were included.Main outcome measuresTreatment for CDI.ResultsCDI treatment was administered in 147 (71%) cases. In multivariate analysis, an abdominal CT scan with signs of colitis (OR 14.7; 95% CI 1.96 to 110.8) was the only factor associated with CDI treatment.ConclusionsThe proportion of NAAT+/EIA− patients who received treatment questions the contribution of the EIA for the detection of toxin A/B after NAAT to limit overtreatment. Additional studies are needed to investigate if other factors are associated with the decision to treat.

scholarly journals Long-Term Duration of Antibody Response to SARS CoV-2 in One of the Largest Slums of Buenos Aires

2021 ◽  
Author(s):  
Vanina Pagotto ◽  
Lorena Luna ◽  
Julieta Salto ◽  
Magdalena Wagner Manslau ◽  
Silvana Figar ◽  
...  
Keyword(s):  
Antibody Response ◽  
Buenos Aires ◽  
Humoral Response ◽  
Cross Sectional Study ◽  
Older Individuals ◽  
Sectional Study ◽  
Cross Sectional ◽  
The People ◽  
Igg Level

AbstractThe durability of the antibody response following severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections has not been fully elucidated. We have performed a cross-sectional study in one of the largest slums of Buenos Aires, Barrio Padre Mugica in June 2020, detecting a seroprevalence of 53.4%. To evaluate the persistence of the humoral response against SARS-CoV-2 in this area, we designed a second study assessing only the people that were IgG positive in the first survey. The IgG levels against the full spike (S) protein in 175 individuals that were seropositive, at least 6 months before, were evaluated in a second survey. The positivity rate was 92.0%, 161 from 175 individuals remained IgG positive. We observed a contraction in the overall IgG levels measured by ELISA. The median IgG dropped 62% from June to December 2020. Most of the individuals tested (87%) reported to be asymptomatic or oligo-symptomatic. No difference was found between men and women, but people aged less than 50 showed a lower IgG level in each period compared to older individuals. Our data indicate sustained humoral immunity for at least 6 months in a specific socio-economical setting in a population that was mainly asymptomatic for COVID-19.

scholarly journals Prevalence ofNeisseria gonorrhoeaeandChlamydia trachomatisin men having sex with men in Port-au-Prince, Haiti: a cross-sectional study

BMJ Open ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. e033976
Author(s):  
Frantz Jean Louis ◽  
Guethina Galbaud ◽  
Maureen Leonard ◽  
Emmanuel Pericles ◽  
Ito Journel ◽  
...  
Keyword(s):  
Risk Behaviour ◽  
Cross Sectional Study ◽  
Nucleic Acid Amplification ◽  
People Living With Hiv ◽  
Key Populations ◽  
Limited Information ◽  
Sectional Study ◽  
Cross Sectional ◽  
Sexually Transmitted ◽  
Sex With Men

ObjectivesOver the last 15 years, the prevalence of HIV in Haiti has stabilised to around 2.0%. However, key populations remain at higher risk of contracting HIV and other sexually transmitted infections (STIs). The prevalence of HIV is 12.9% among men having sex with men (MSM). There is limited information about the prevalence of other STI in the Haitian population in general and even less among key populations. We assessed the burden ofChlamydia trachomatis(CT) andNeisseria gonorrhoeae(NG) and risk factors for infections among MSM in Haiti.MethodsA cross-sectional study was conducted. MSM were recruited from seven health facilities in Port-au-Prince. All samples were tested by nucleic acid amplification test, using GeneXpert. A survey was administered to the participants to collect socio-demographic, clinical and risk behaviour data.ResultsA total of 216 MSM were recruited in the study. The prevalence rates of CT and NG were 11.1% and 16.2%, respectively. CT NG co-infections were found in 10/216 (4.6%) of the participants. There were 39 MSM with rectal STI compared with 17 with genital infections. Participants between 18–24 and 30–34 years old were significantly more likely to be infected with NG than those aged 35 years or older (OR: 22.96, 95% CI: 2.79 to 188.5; OR: 15.1, 95% CI: 1.68 to 135.4, respectively). Participants who never attended school or had some primary education were significantly more likely to be infected with NG than those with secondary education or higher (OR: 3.38, 95% CI: 1.26 to 9.07). People tested negative for HIV were significantly more likely to be infected with CT than people living with HIV/AIDS (OR: 3.91, 95% CI: 1.37 to 11.2).ConclusionsPeriodic risk assessment and testing for STI should be offered in Haiti as part of a comprehensive strategy to improve the sexual health of key populations.

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