Publications by authors named "Patricia Tuccillo"

2 Publications

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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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http://dx.doi.org/10.1016/j.ebiom.2021.103357DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8153212PMC
May 2021

Unusual clinical presentation of brucellosis caused by Brucella canis.

J Med Microbiol 2005 May;54(Pt 5):505-508

Brucellosis Laboratory, Administración Nacional de Laboratorios e Institutos de Salud Dr C. G. Malbrán (ANLIS), Avda. Velez Sarsfield 563, 1281 Buenos Aires, Argentina 2Unidad de Transplante Renal, Hospital Cosme Argerich, Margall 750, 1155 Buenos Aires, Argentina 3Hospital Naval 'Pedro Mallo', Patricias Argentinas 351, 1405 Buenos Aires, Argentina 4Laboratoire de Pathologie Infectieuse et Immunologie, Institut National de la Recherche Agronomique, 37380 Nouzilly, France.

Brucella canis is considered a rare cause of human brucellosis. The clinical importance of this infection may have been underestimated so far because of difficulties with presumptive diagnosis. The case described here presented symptoms compatible with brucellosis but the routine tests using Brucella abortus antigen were negative. The infection would have remained undiagnosed if culture had not been positive. This case illustrates the potential for a favourable outcome in Brucella canis diagnosis and supports recommendations for the use of B. canis serology. The infection should be suspected in patients with compatible symptoms and negative serology for B. abortus antigen.
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http://dx.doi.org/10.1099/jmm.0.45928-0DOI Listing
May 2005