Publications by authors named "María J Chiolo"

3 Publications

  • Page 1 of 1

Blood neutrophils from children with COVID-19 exhibit both inflammatory and anti-inflammatory markers.

EBioMedicine 2021 May 9;67:103357. Epub 2021 May 9.

División Infectología, Hospital General de Agudos Dr. Juan A. Fernández, Av. Cerviño 3356, CABA C1425, Argentina.

Background: Perhaps reflecting that children with COVID-19 rarely exhibit severe respiratory symptoms and often remain asymptomatic, little attention has been paid to explore the immune response in pediatric COVID-19. Here, we analyzed the phenotype and function of circulating neutrophils from children with COVID-19.

Methods: An observational study including 182 children with COVID-19, 21 children with multisystem inflammatory syndrome (MIS-C), and 40 healthy children was performed in Buenos Aires, Argentina. Neutrophil phenotype was analyzed by flow cytometry in blood samples. Cytokine production, plasma levels of IgG antibodies directed to the spike protein of SARS-CoV-2 and citrullinated histone H3 were measured by ELISA. Cell-free DNA was quantified by fluorometry.

Findings: Compared with healthy controls, neutrophils from children with COVID-19 showed a lower expression of CD11b, CD66b, and L-selectin but a higher expression of the activation markers HLA-DR, CD64 and PECAM-1 and the inhibitory receptors LAIR-1 and PD-L1. No differences in the production of cytokines and NETs were observed. Interestingly, the expression of CD64 in neutrophils and the serum concentration of IgG antibodies directed to the spike protein of SARS-CoV-2 distinguished asymptomatic from mild and moderate COVID-19.

Interpretation: Acute lung injury is a prominent feature of severe COVID-19 in adults. A low expression of adhesion molecules together with a high expression of inhibitory receptors in neutrophils from children with COVID-19 might prevent tissue infiltration by neutrophils preserving lung function.

Funding: This study was supported by the Ministry of Science and Technology (National Agency for Scientific and Technological Promotion, IP-COVID-19-0277 and PMO BID PICT 2018-2548), and University of Buenos Aires from Argentina (20020170100573BA).
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May 2021

Patients assisted at the Department of Medicine of a pediatric hospital at the beginning of the COVID-19 pandemic in Buenos Aires, Argentina.

Arch Argent Pediatr 2020 12;118(6):418-426

Departamento de Medicina, Hospital General de Niños Pedro de Elizalde, Ciudad Autónoma de Buenos Aires, Argentina.

Introduction: Despite the magnitude of the COVID-19 pandemic, the information about its development in pediatrics is still limited. This report describes the characteristics of patients admitted to a children's hospital due to COVID-19 during the first three months of the pandemic.

Method: Descriptive study including all patients hospitalized due to COVID-19 between 4/1/2020 and 6/30/2020.

Results: A total of 191 patients were hospitalized due to COVID-19; their median age was 7.7 years; 89% had a history of close contact. Of them, 35.6 % were considered asymptomatic; 61.2 %, mild cases; and 3.2 %, moderate cases (no severe cases). None of them received a specific treatment for the disease. The most common symptoms were fever, sore throat, and cough. The median length of stay was 6 days.

Conclusion: A total of 191 cases of children and adolescents admitted due to COVID-19 are reported. Most were asymptomatic or presented with a mild disease.
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December 2020

[Evaluation of two standardized methods for chest radiographs interpretation in children with pneumonia].

Arch Argent Pediatr 2008 Dec;106(6):510-4

División Neumonología, Hospital de Niños Dr. Pedro de Elizalde, Buenos Aires, Argentina.

Objective: To evaluate the accuracy of World Health Organization (WHO) method of interpreting chest radiographs on identifying young children with bacterial pneumonia, and to compare its accuracy with other method.

Methods: Chest radiographs from children aged under 5 years old hospitalized for pneumonia, with microbiological evidence of bacterial or viral infection, were evaluated by 3 observers blinded to other data (pediatrician [P], pulmonologist [N], radiologist [R]) according to WHO and Khamapirad scores. A WHO score=1 and a Khamapirad score >2 were selected as the thresholds suggesting bacterial pneumonia. The relationship between radiographic scores and etiology was evaluated using chi square. Sensitivity (Se), specificity (Sp), positive (PPV) and negative (NPV) predictive values for predicting bacterial pneumonia were calculated. Interobserver agreement (P vs. N vs. R) was calculated (kappa).

Results: 108 chest radiographs were evaluated (87 viral, 21 bacterial). WHO score= 1 was associated with bacterial pneumonia (p <0.001; OR= 6.4; CI 95%= 1.629.7), achieving a Se= 85%, Sp= 51%, PPV= 30%, NPV= 93%. Khamapirad score >2, evaluated by P, was also associated with bacterial pneumonia (p <0.0008; OR= 6.31; CI 95%= 1.8-24.4), achieving a Se= 80%, Sp= 59%, PPV= 32% NPV= 92%. Interobserver agreement was slightly better using WHO score (P vs. N= 0.82, P vs. R= 0.69, N vs. R= 0.85) than Khamapirad score (P vs. N= 0.48, P vs. R= 0.69, N vs. R= 0.82).

Conclusions: Both methods showed similar accuracy in order to identify bacterial pneumonia. WHO score is simpler than Khamapirad score and showed a better interobserver agreement.
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December 2008