Antimicrobial effect of Pentaclethra Macroloba plant extract against Enterococcus Faecalis.

This study evaluated the antimicrobial efficacy of a new intracanal drug based on Pentaclethra macroloba extract, a plant of Amazonian origin, against Enterococcus faecalis using macrodilution test and intratubular evaluation with Confocal Laser Scanning Microscopy (CLSM). The minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of the pure extract of Pentaclethra macroloba andits association with calcium hydroxide and ultracall were determined. Then, thirty-three dentin cylinders were prepared and inoculated with E. faecalis, to evaluate the antimicrobial effect of the medications on the dentinal tubules with CLSM. The data was analyzed using the Kruskal-Wallis and Dunn tests. The extract in association with calcium hydroxide showed a lower CBM, and in the intratubular test all tested medications were effective against E. faecalis (P >0.05). The new intracanal drug based on P. macroloba extract has an antimicrobial effect against E. faecalis and further studies are needed for its clinical use.

Spin-Orbit and Zeeman Effects on the Electronic Properties of Single Quantum Rings: Applied Magnetic Field and Topological Defects.

Within the framework of effective mass theory, we investigate the effects of spin-orbit interaction (SOI) and Zeeman splitting on the electronic properties of an electron confined in GaAs single quantum rings. Energies and envelope wavefunctions in the system are determined by solving the Schrödinger equation via the finite element method. First, we consider an inversely quadratic model potential to describe electron confining profiles in a single quantum ring. The study also analyzes the influence of applied electric and magnetic fields. Solutions for eigenstates are then used to evaluate the linear inter-state light absorption coefficient through the corresponding resonant transition energies and electric dipole matrix moment elements, assuming circular polarization for the incident radiation. Results show that both SOI effects and Zeeman splitting reduce the absorption intensity for the considered transitions compared to the case when these interactions are absent. In addition, the magnitude and position of the resonant peaks have non-monotonic behavior with external magnetic fields. Secondly, we investigate the electronic and optical properties of the electron confined in the quantum ring with a topological defect in the structure; the results show that the crossings in the energy curves as a function of the magnetic field are eliminated, and, therefore, an improvement in transition energies occurs. In addition, the dipole matrix moments present a non-oscillatory behavior compared to the case when a topological defect is not considered.

Consensus on complementary feeding from the Latin American Society for Pediatric Gastroenterology, Hepatology and Nutrition: COCO 2023.

Complementary feeding (CF) is defined as the feeding of infants that complements breastfeeding, or alternatively, feeding with a breast milk substitute, and is a process that is more than simply a guide as to what and how to introduce foods. The information provided by healthcare professionals must be up-to-date and evidence-based. Most of the recommendations that appear in the different international guidelines and position papers are widely applicable, but some must be regionalized or adapted to fit the conditions and reality of each geographic zone. The Nutrition Working Group of the Latin American Society for Pediatric Gastroenterology, Hepatology and Nutrition (LASPGHAN) summoned a group of experts from each of the society's member countries, to develop a consensus on CF, incorporating, whenever possible, local information adapted to the reality of the region. The aim of the present document is to show the results of that endeavor. Utilizing the Delphi method, a total of 34 statements on relevant aspects of CF were evaluated, discussed, and voted upon.

Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects.

A theoretical analysis of optical properties in a ZnS/CdS/ZnS core/shell/shell spherical quantum dot was carried out within the effective mass approximation. The corresponding Schrödinger equation was solved using the finite element method via the 2D axis-symmetric module of COMSOL-Multiphysics software. Calculations included variations of internal dot radius, the application of electric and magnetic fields (both oriented along z-direction), as well as the presence of on-center donor impurity. Reported optical properties are the absorption and relative refractive index change coefficients. These quantities are related to transitions between the ground and first excited states, with linearly polarized incident radiation along the z-axis. It is found that transition energy decreases with the growth of internal radius, thus causing the red-shift of resonant peaks. The same happens when the external magnetic field increases. When the strength of applied electric field is increased, the opposite effect is observed, since there is a blue-shift of resonances. However, dipole matrix moments decrease drastically with the increase of the electric field, leading to a reduction in amplitude of optical responses. At the moment impurity effects are activated, a decrease in the value of the energies is noted, significantly affecting the ground state, which is more evident for small internal radius. This is reflected in an increase in transition energies.

PLGA-TiO2 as a Carrier System for Drug Release.

This paper reports the results of the PLGA-TiO2 nanocomposite regarding the green synthesis of titanium dioxide nanoparticles using a natural extract, its characterization, and encapsulation with poly(lactic-co-glycolic acid) (PLGA). UV-visible spectrometry was used for the identification of terpenes present in the extracts. The morphology of the nanoparticles was determined by scanning electron microscopy. Infrared spectroscopy was used for the determination of functional groups, while X-ray diffraction was used to determine the crystal structure. The analysis of the extended release of the encapsulated extract in the matrix of the nanomaterial resulted in a maximum visible UV absorbance at approximately 260 nm and confirmed the synthesis of titanium dioxide nanoparticles. Moreover, terpenes enhance synthesis and stabilize titanium dioxide nanoparticles. The synthesized structures are spherical and amorphous, 44 nm in size, and encapsulated at 65 nm.

A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties.

This study aimed to develop Ca2+ doped ZnO nanoparticles (NPs) and investigate their antibacterial properties against microorganisms of dental interest. Zn-Ca NPs were synthesized by the sol-gel method with different concentrations of Ca2+ (1, 3, and 5 wt. %) and subsequently characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-vis spectroscopy and Fourier transform infrared spectroscopy (FT-IR). The Kirby-Bauer method was used to measure antibacterial effects. NPs showed the wurzite phase of ZnO and bandgap energies (Eg) from 2.99 to 3.04 eV. SEM analysis showed an average particle size of 80 to 160 nm. The treatments that presented the best antibacterial activity were Zn-Ca 3% and Zn-Ca 5%. ZnO NPs represent an alternative to generate and improve materials with antibacterial capacity for dental applications.

Survey of selected pathogens in free-ranging pinnipeds in Uruguay.

Marine mammals, regarded as sentinels of aquatic ecosystem health, are exposed to different pathogens and parasites under natural conditions. We surveyed live South American fur seals Arctocephalus australis and South American sea lions Otaria flavescens in Uruguay for Leptospira spp., canine distemper virus (CDV), Mycobacterium spp., Toxoplasma gondii, and Neospora caninum. Samples were collected from 2007 to 2013. The seroprevalence of Leptospira spp. was 37.6% positive, 50.9% negative, and 11.5% suspect for A. australis (n = 61) while for O. flavescens (n = 12) it was 67% positive, 25% negative, and 8% suspect. CDV RNA was not detected in any of the analyzed samples. Most animals tested seropositive to tuberculosis antigens by WiZo ELISA (A. australis: 29/30; O. flavescens: 20/20); reactivity varied with a novel ELISA test (antigens MPB70, MPB83, ESAT6 and MPB59). Seroprevalence against N. caninum and T. gondii was 6.7 and 13.3% positive for O. flavescens and 0 and 2.2% positive for A. australis respectively. To evaluate possible sources of infection for pinnipeds, wild rats Rattus rattus and semi-feral cats Felis catus were also tested for Leptospira spp. and T. gondii respectively. Water samples tested for Leptospira revealed saprofitic L. bioflexa. Pathogenic Leptospira were detected in the kidneys of 2 rats, and cats tested positive for T. gondii (100%). These results represent a substantial contribution to the study of the health status of wild pinnipeds in Uruguay.

Effect of COVID-19 on cardiorenal axis: known or unknown universe?

Recent findings have confirmed relationships between coronavirus disease (COVID-19) and multiple organ dysfunction. The prevalence of cardiac and renal involvement in COVID-19 has been increasingly reported and is a marker of severe disease that not only directly or indirectly affects the organs, but may also exacerbate the underlying comorbid illness. In addition, patients affected by the new coronavirus present a systemic inflammatory condition that results in damage to several tissues, especially the heart, kidneys, and vessels. It is well known that the heart and kidneys are closely related, so that any change in one of the organs can lead to damage to the other, establishing the so-called cardiorenal syndrome. Herein, we explore some case reports of patients with COVID-19 who had heart and kidney abnormalities, consequently resulting in worse prognosis of the disease. These results highlight the importance of understanding the cause and effect between the cardiac and renal systems and the course of early SARS-CoV-2 infection.

[Characterization of a cohort of pediatric patients with Congenital Adrenal Hyperplasia]. / Caracterización de una cohorte de pacientes pediátricos con Hiperplasia Suprarrenal Congénita.

Congenital adrenal hyperplasia (CAH) is the most common adrenal disorder in childhood. Objecti ve: To describe the clinical and laboratory characteristics of pediatric patients with CAH and perform an exploratory analysis comparing some clinical and laboratory variables according to the types of CAH. PATIENTS AND METHOD: Observational descriptive longitudinal study. Medical records from the pediatric endocrinology outpatients from four institutions in Medellín, Colombia were reviewed. Sociodemographic, clinical (type of CAH, salt-wasting crisis, associated endocrinopathies), labora tory (17-hydroxyprogesterone, testosterone, dehydroepiandrosterone sulfate, androstenedione, cor tisol, and adrenocorticotropic hormone) variables were analyzed. A descriptive statistical analysis was carried out. RESULTS: 132 patients (65% female) were included. The median age at diagnosis was 2 months, 44.7% neonatal diagnosis. Seventy-nine children with classical salt-wasting CAH, 31 with simple virilizing, and 22 with non-classical form were documented. Median 17-OHP at diagnosis was 4820 ng/dl. Sexual differentiation disorder was presented in 47% of patients and 48% presented with adrenal crisis (AC) at diagnosis; the median age of the first AC was 15 days. Ninety-three patients required fludrocortisone and 32 patients presented AC after diagnosis and treatment. Median height/ age (last appointment): -0.49 SD, difference between bone and chronological age: 26 months. More than 60% of patients had elevated androstenedione and/or testosterone at the last appointment. CONCLUSIONS: Sociodemographic and clinical characteristics are similar to those reported in the literature. In 48% of patients, AC was the initial manifestation, making neonatal screening important, as it would allow an early diagnosis. We found virilization in 71% of women in our study. A CAH should be suspected in a newborn with different genitalia.

Effect of COVID-19 on cardiorenal axis: known or unknown universe?

Recent findings have confirmed relationships between coronavirus disease (COVID-19) and multiple organ dysfunction. The prevalence of cardiac and renal involvement in COVID-19 has been increasingly reported and is a marker of severe disease that not only directly or indirectly affects the organs, but may also exacerbate the underlying comorbid illness. In addition, patients affected by the new coronavirus present a systemic inflammatory condition that results in damage to several tissues, especially the heart, kidneys, and vessels. It is well known that the heart and kidneys are closely related, so that any change in one of the organs can lead to damage to the other, establishing the so-called cardiorenal syndrome. Herein, we explore some case reports of patients with COVID-19 who had heart and kidney abnormalities, consequently resulting in worse prognosis of the disease. These results highlight the importance of understanding the cause and effect between the cardiac and renal systems and the course of early SARS-CoV-2 infection.

Survival of COVID-19 with Multimorbidity Patients.

BACKGROUND: The outbreak of SARS-CoV-2 abruptly disseminated in early 2020, overcoming the capacity of health systems to respond the pandemic. It was not until the vaccines were launched worldwide that an increase in survival was observed. The objectives of this study were to analyse the characteristics of survivors and their relationship with comorbidities. We had access to a database containing information on 16,747 hospitalized patients from Mexico, all infected with SARS-CoV-2, as part of a regular follow-up. The descriptive analysis looked for clusters of either success or failure. We categorized the samples into no comorbidities, or one and up to five coexisting with the infection. We performed a logistic regression test to ascertain what factors were more influential in survival. The main variable of interest was survival associated with multimorbidity factors. The database hosted information on hospitalized patients from Mexico between March 2020 through to April 2021. Categories 2 and 3 had the largest number of patients. Survival rates were higher in categories 0 (64.8%), 1 (57.5%) and 2 (51.6%). In total, 1741 (10.5%) patients were allocated to an ICU unit. Mechanical ventilators were used on 1415 patients, corresponding to 8.76%. Survival was recorded in 9575 patients, accounting for 57.2% of the sample population. Patients without comorbidities, younger people and women were more likely to survive.

Phosphorene and phosphorene oxides as a toxic gas sensor materials: a theoretical study.

A systematic study of the adsorption of several harmful gases (CO2, NO, SO2, NH3y H2S) onto black phosphorene and three different black phosphorene oxides (BPO) is carried out through density functional theory calculations. In general, it is shown that BPOs are more suitable adsorbents than pure black phosphorene. Smaller values of adsorption energy correspond to CO2molecules, whilst those exhibiting larger ones are NH3, H2S, NO y SO2. It is found that SO2shows the greater difference in electronic charge transfer as well as the longer time of recovery among all species, being an electron acceptor molecule. Besides, it is revealed that physisorption induces changes of different order in the electronic, magnetic and optical responses of phosphorene systems involved. Greater changes in the electronic structure are produced in the case of NO adsorption. In that case, semiconductor nature and magnetization features of black phosphorene band structure become significantly modified. Moreover, a notorious effect of an externally applied electric field on the molecule adsorption onto BPOs has been detected. In accordance, adsorption energy changes with the applied electric field direction, in such a way that the higher value is favored through an upwards-directed orientation of NO y SO2adsorbates. Results presented could help to enhancing the understanding of BPOs as possible candidates for applications in gas sensing.

GEIS-SEHOP clinical practice guidelines for the treatment of rhabdomyosarcoma.

Rhabdomyosarcoma (RMS) is the most frequent soft tissue sarcoma (STS) in children and adolescents. In Spain the annual incidence is 4.4 cases per million children < 14 years. It is an uncommon neoplasm in adults, but 40% of RMS are diagnosed in patients over 20 years of age, representing 1% of all STS in this age group. RMS can appear anywhere in the body, with some sites more frequently affected including head and neck, genitourinary system and limbs. Assessment of a patient with suspicion of RMS includes imaging studies (MRI, CT, PET-CT) and biopsy. All patients with RMS should receive chemotherapy, either at diagnosis in advanced or metastatic stages, or after initial resection in early local stages. Local control includes surgery and/or radiotherapy depending on site, stage, histology and response to chemotherapy. This guide provides recommendations for diagnosis, staging and treatment of this neoplasm.

Occurrence of multidrug-resistant Enterococcus faecium isolated from environmental samples.

Enterococcus species are present in the microbiota of humans and animals and have also been described in the environment. Among the species, Enterococcus faecium is one of the main pathogens associated with nosocomial infections worldwide. Enterococcus faecium isolates resistant to different classes of antimicrobials have been increasingly reported, including multidrug-resistant (MDR) isolates in environmental sources, which is worrying. Therefore, this study aimed to characterize E. faecium isolates obtained from soil and water samples regarding antimicrobial resistance and virulence determinants. A total 40 E. faecium isolates were recovered from 171 environmental samples. All isolates were classified as MDR, highlighting the resistance to the fluoroquinolones class, linezolid and vancomycin. Furthermore, high-level aminoglycoside resistance and high-level ciprofloxacin resistance were detected in some isolates. Several clinically relevant antimicrobial resistance genes were found, including vanC1, ermB, ermC, mefAE, tetM, tetL, ant(6')-Ia, ant(4')-Ia, aph(3')-IIIa and aac(6')-Ie-aph(2″)-Ia. Three virulence genes were detected among the MDR E. faecium isolates, such as esp, gelE and ace. The results of this study contribute to a better understanding of MDR E. faecium isolates carrying antimicrobial resistance and virulence genes in environmental sources and report for the first time in the world the presence of vanC1-producing E. faecium isolated from soil.

Prototype of the National Dose Register (NDR) for Latin America: main experiences in design and implementation.

Several national regulations and good international practices promote the existence of a central register with the results of individual radiological monitoring. In the majority of countries (in the Latin American region), dosimetry data were neither harmonised nor managed by a unique database, and therefore the possibility of using such data for proper characterisation of the radiological conditions, integrally at national level, in a territory or sector, and by practice or occupational category, was very limited. All these considerations justified the need for developing a prototype of a National Dose Register (NDR) for Latin America. The main objectives were the strengthening of safety supervision in nuclear applications and the provision of a surveillance system for occupational exposure as well as the centralisation of personal dosimetry data, compiling all doses evaluated by the different dosimetric service providers. The experience of Cuba and Brazil in the implementation of their national registers was well known, and was accordingly used as the basis for designing this software. The first version of the NDR prototype, developed in the Spanish language, has been designed, developed and validated. So far, 16 countries have started to implement the NDR. The present work describes aspects such as the technical bases of the NDR design, its characteristics and its functionalities. Experience gained during implementation in Latin America is also addressed. Having a common system of dosimetric information management in the region has opened an important space for scientific exchanges between the countries and their competent authorities. The NDR implementation has provided regulatory authorities with a tool that permits the verification of the level of compliance with dose limits and restrictions, as well as allowing them to carry out statistical assessments of the results of individual radiological surveillance that may permit evaluation of the appropriateness and effectiveness of workplace radiation protection programmes, contributing to their optimisation.

Effect of intrabronchial platelet rich plasma on the exercise-induced pulmonary hemorrhage endoscopic score in thoroughbred racehorses using furosemide: a preliminary study / [Efeito da instilação intrabronquial de plasma rico em plaquetas no escore endoscópico da hemorragia pulmonar induzida por exercício em cavalos Puro-Sangue Inglês de corrida e usuários de furosemida: um estudo preliminar]

The high prevalence of exercise-induced pulmonary hemorrhage (EIPH) in athletic horses constitutes to be a challenge to the racing industry and a source of major concern to animal welfare. Both experimental and clinical evidence indicate that the use of autologous platelet-rich plasma (PRP) is a promising effector of repair in a variety of pulmonary conditions. The present study evaluated the effect of intrabronchial instillation of PRP on EIPH endoscopic scores from 37 Thoroughbred racehorses. Inclusion criteria were for animals to be EIPH-positive in, at least, two consecutive post-exercise endoscopic exams and to receive 250mg of furosemide IV four hours before racing. Animals were randomly assigned into 3 groups: placebo, control, and PRP instillation. All 37 Thoroughbred racehorses included had EIPH endoscopic scores pre- and post- treatment compared by statistical analysis. The bleeding score from the group receiving PRP was significantly lower than in the control and placebo groups. No adverse effects were observed in any animal during or after the experiment. It was possible to conclude that the intrabronchial instillation of autologous PRP was effective in reducing EIPH scores in racehorses receiving furosemide and that this bioproduct can be considered as a promising coadjuvant in controlling EIPH in athletic horses.(AU)

A alta prevalência de hemorragia pulmonar induzida por exercício (HPIE) em cavalos atletas é um desafio de longa data para a indústria de corridas, além de figurar como grande preocupação sobre o bem-estar animal. As evidências experimentais e clínicas indicam que o uso do plasma rico em plaquetas (PRP) de fonte autógena é promissor na terapêutica de diversas lesões pulmonares. O presente estudo objetivou avaliar as mudanças após corrida no escore endoscópico de HPIE de 37 cavalos Puro-Sangue Inglês que receberam instilação intrabronquial de PRP autólogo. Os animais selecionados eram HPIE-positivos em, ao menos, dois exames endoscópicos consecutivos e recebiam 250mg de furosemida IV administrado quatro horas antes de cada corrida. Na comparação dos escores endoscópicos pré e pós-tratamento, verificou-se que o escore de HPIE do grupo tratado com PRP foi significantemente menor que o dos grupos controle e placebo. Nenhum efeito adverso foi observado nos animais durante ou após o experimento. Concluiu-se que a instilação intrabronquial de PRP autólogo foi efetiva na redução do escore de HPIE de cavalos de corrida usuários de furosemida e que este bioproduto pode ser considerado uma alternativa promissora no controle de HPIE em cavalos atletas.(AU)

Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach.

We theoretically investigate the electron and hole states in a semiconductor quantum dot-quantum ring coupled structure, inspired by the recent experimental report by Elborg and collaborators (2017). The finite element method constitutes the numerical technique used to solve the three-dimensional effective mass equation within the parabolic band approximation, including the effects of externally applied electric and magnetic fields. Initially, the features of conduction electron states in the proposed system appear discussed in detail, under different geometrical configurations and values of the intensity of the aforementioned electromagnetic probes. In the second part, the properties of an electron-hole pair confined within the very kind of structure reported in the reference above are investigated via a model that tries to reproduce as close as possible the developed profile. In accordance, we report on the energies of confined electron and hole, affected by the influence of an external electric field, revealing the possibility of field-induced separate spatial localization, which may result in an indirect exciton configuration. In relation with this fact, we present a preliminary analysis of such phenomenon via the calculation of the Coulomb integral.

Mechanisms involved in the adaptation of Escherichia coli O157:H7 to the host intestinal microenvironment.

Host adaptation of pathogens may increase intra- and interspecies transmission. We showed previously that the passage of a clinically isolated enterohemorrhagic Escherichia coli (EHEC) O157 strain (125/99) through the gastrointestinal tract of mice increases its pathogenicity in the same host. In this work, we aimed to elucidate the underlying mechanism(s) involved in the patho-adaptation of the stool-recovered (125RR) strain. We assessed the global transcription profile by microarray and found almost 100 differentially expressed genes in 125RR strain compared with 125/99 strain. We detected an overexpression of Type Three Secretion System (TTSS) proteins at the mRNA and protein levels and demonstrated increased adhesion to epithelial cell lines for the 125RR strain. Additional key attributes of the 125RR strain were: increased motility on semisolid agar, which correlated with an increased fliC mRNA level; reduced Stx2 production at the mRNA and protein levels; increased survival at pH 2.5, as determined by acid resistance assays. We tested whether the overexpression of the LEE-encoded regulator (ler) in trans in the 125/99 strain could recreate the increased pathogenicity observed in the 125RR strain. As anticipated ler overexpression led to increased expression of TTSS proteins and bacterial adhesion to epithelial cells in vitro but also increased mortality and intestinal colonization in vivo. We conclude that this host-adaptation process required changes in several mechanisms that improved EHEC O157 fitness in the new host. The research highlights some of the bacterial mechanisms required for horizontal transmission of these zoonotic pathogens between their animal and human populations.

Subgrupos A1, A2 y AINT en donantes efectivos del banco de sangre materno infantil CNS La Paz ­ Bolivia / Subgroups A1, A2 and AINT in effective donors of the maternal and child blood bank CNS La Paz - Bolivia

Además del sistema ABO, los subgrupos del mismo revisten gran importancia en inmunohematología, Los subgrupos A difieren tanto en el número de sitios antigénicos como en la configuración del antígeno eritrocitario. Los principales, A1 y A2 se diferencian en que los eritrocitos A1 son aglutinados por el anticuerpo Anti-A1 humano o por la Lectina Anti-A1 (Dolichos biflorus), y los eritrocitos A2 son aglutinados por la Lectina Anti-H (Ulex europaeus). MATERIALES Y MÉTODOS: se realizó un estudio descriptivo, de Corte Transversal, Se analizó los registros tanto físico y electrónico del Banco de Sangre, se incluyeron todos los donadores efectivos, mismos que fueron tipificados por el laboratorio de inmunohematología en el periodo de mayo a julio del 2018. Método empleado, aglutinación en tubo y en micro placa. RESULTADOS: en un total de 1599 donantes, se determinó que el grupo O tiene mayor frecuencia con un 84% y el menos frecuente fue el AB con un 0,66%. Según el grupo sanguíneo A y AB tenemos las siguientes frecuencias: A1 que representa el (73.3%), A2 el (15.9%), Aint el (5.65%), A1 B el (3.60%) y A2 B el (1.55%). La importancia clínica se basa en que algunas personas del grupo A2 transfundidas con A1 , pueden producir Anti-A1 que es un anticuerpo natural irregular activo a 22 ºC, pero en ocasiones está activo a 37ºC causando una reacción transfusional extravascular, por lo que, si no se cuenta con eritrocitos A2 , se recomienda transfundir eritrocitos grupo O.

In addition to the ABO system, its subgroups review great importance in Immunohematology. Subgroups A differ both in the number of antigenic sites and in the configuration of the erythrocyte antigen. The main ones, A1 and A2 differ in that A1 erythrocytes are agglutinated by human Anti-A1 antibody or by Anti-A1 Lectin (Dolichos biflorus), and A2 erythrocytes are agglutinated by Anti-H Lectin (Ulex europaeus). MATERIALS AND METHODS: a descriptive, cross-sectional study was conducted. The physical and electronic records of the Blood Bank were analyzed, all effective donors were included, which were typified by the Immunohematology Laboratory in the period of May. to July 2018. Method used, agglutination in tube and in microplate. RESULTS: in a total of 1599 protocols, it was determined that group O has the highest frequency with 84% and the least frequent was the AB with 0.66%. According to blood group A and AB we have the following frequencies: A1 representing (73.3%), A2 (15.9%), Aint (5.65%), A1B (3.60%) and A2B (1.55%). The clinical importance is based on the fact that some people in group A2 transfused with A1, can produce Anti-A1 which is an irregular natural antibody active at 22 ° C but sometimes it is active at 37 °C causing an extravascular transfusion reaction, so if A2 erythrocytes are not available, it is recommended to transfuse group O erythrocytes.