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1.
Article in Portuguese | LILACS, CONASS, ColecionaSUS, SES-SP, SESSP-IALPROD, SES-SP | ID: biblio-1247788

ABSTRACT

The ability of the new coronavirus SARS-CoV-2 to spread and contaminate is one of the determinants of the COVID-19 pandemic status. SARS-CoV-2 has been detected in saliva consistently, with similar sensitivity to that observed innasopharyngeal swabs. We conducted ultrasound-guided postmortem biopsies in COVID-19 fatal cases. Samples ofsalivary glands (SGs; parotid, submandibular, and minor) were obtained. We analyzed samples using RT-qPCR, immu-nohistochemistry, electron microscopy, and histopathological analysis to identify SARS-CoV-2 and elucidate qual-itative and quantitative viral proles in salivary glands. The study included 13 female and 11 male patients, with amean age of 53.12 years (range 8­83 years). RT-qPCR for SARS-CoV-2 was positive in 30 SG samples from18 patients (60% of total SG samples and 75% of all cases). Ultrastructural analyses showed spherical 70­100 nm viral particles, consistent in size and shape with the Coronaviridae family, in the ductal lining cell cytoplasm,acinar cells, and ductal lumen of SGs. There was also degeneration of organelles in infected cells and the presence of acluster of nucleocapsids, which suggests viral replication in SG cells. Qualitative histopathological analysis showedmorphologic alterations in the duct lining epithelium characterized by cytoplasmic and nuclear vacuolization, as wellas nuclear pleomorphism. Acinar cells showed degenerative changes of the zymogen granules and enlarged nuclei.Ductal epithelium and serous acinar cells showed intense expression of ACE2 and TMPRSS receptors. An anti-SARS-CoV-2 antibody was positive in 8 (53%) of the 15 tested cases in duct lining epithelial cells and acinar cellsof major SGs. Only two minor salivary glands were positive for SARS-CoV-2 by immunohistochemistry. Salivaryglands are a reservoir for SARS-CoV-2 and provide a pathophysiological background for studies that indicate theuse of saliva as a diagnostic method for COVID-19 and highlight this biological uid's role in spreading the disease.© 2021 The Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.


Subject(s)
Salivary Glands, Minor , Water Reservoirs , Coronavirus , Betacoronavirus
2.
Rev. bras. hematol. hemoter ; 31(6)2009. graf, tab
Article in Portuguese | LILACS | ID: lil-540390

ABSTRACT

A contagem de plaquetas por microscopia é uma ferramenta fundamental na avaliação dos pacientes com doenças que acometem as plaquetas, na medida em que complementa e corrobora as informações fornecidas pelos analisadores hematológicos, além de servir de ferramenta de controle interno da qualidade das contagens automatizadas de plaquetas. O objetivo deste trabalho foi comparar quatro métodos manuais de estimativa microscópica da contagem de plaquetas, considerando a correlação com a contagem automatizada de plaquetas e a correlação entre um método e outro, além de fornecer subsídios para a validação dos mesmos nos laboratórios de hematologia. Foram avaliados, neste trabalho, o método de Fonio modificado, o de Bárbara H. O'Connor, o de Nosanchuk, Chang & Bennett e um método alternativo baseado em um cálculo envolvendo a hemoglobina do paciente. Todos obtiveram boa correlação estatística quando comparados com a contagem automatizada de plaquetas e entre um e outro, sugerindo que o seu uso pode ser recomendado na avaliação plaquetária de pacientes com os mais diversos valores de contagem de plaquetas.


The platelet blood smear is an important tool in the evaluation of platelet disorders because it adds useful information to data provided by hematology analyzers. Furthermore, it serves as a tool for the internal quality control of automated counts. The aim of this work was to compare four manual methods of estimating platelets and to correlate the results with automated platelet counts. This study may also assist in the validation of these methods. The methodologies evaluated in this work were the modified Fonio method, the Barbara H. O'Connor method, the Nosanchuk Chang & Bennett method and an alternative method based on the patient's hemoglobin. All methodologies had good correlation coefficients both when compared with the other methods tested and with automated platelet counts suggesting that their use can be recommended for the evaluation of the platelet status of any patient.


Subject(s)
Humans , Blood Platelet Disorders , Clinical Laboratory Techniques , Platelet Count , Thrombocytopenia , Thrombocytosis , Laboratory Test/methods
3.
Rev. bras. anal. clin ; 32(3): 233-5, 2000. tab, graf
Article in Portuguese | LILACS | ID: lil-296356

ABSTRACT

O RDW (red cell distribution width) é uma constante que, atualmente, está incorporada ao eritrograma de muitos contadores automatizados e que se reveste de uma importância muito grande na interpretaçäo laboratorial das anemias. O valor de referência utilizado para a interpretaçäo do RDW é o que acompanha os aparelhos e näo o da nossa populaçäo. O presente trabalho estabelece o valor de referência para o RDW em nossa populaçäo


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Anemia, Hypochromic/diagnosis , Anemia/diagnosis , Erythrocyte Indices , Reference Values
4.
Rev. bras. anal. clin ; 31(3): 133-135, 1999. tab, ilus
Article in Portuguese | LILACS | ID: lil-522838

ABSTRACT

Relata-se um caso de diagnóstico da síndrome de Turner pela análise citogenética onde se obteve o resultado de um mosaicismo cromossômico com a formação de um cromossomo em anel. Uma menina de 9 anos, apresentando velocidade de crescimento abaixo da normalidade, com características fenotípicas leves, convergentes à síndrome de Turner, foi submetida à realização da análise cromossômica, obtendo-se quatro linhagens celulares distintas 46,XX/46,Xr(X)/45,X/45,r(X). Além de divulgar os achados citogenéticos raros, o trabalho objetiva evidenciar a importância da citogenética na confirmação das síndromes cromossômicas.


Subject(s)
Humans , Female , Child , Cytogenetic Analysis , Cytogenetics , Molecular Diagnostic Techniques , Mosaicism , Turner Syndrome
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