Oscar Tamez-Rivera

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Verified

Oscar verified their affiliation via an institutional email.

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• MD MSc
• Researcher at Tecnológico de Monterrey

Rocky Mountain spotted fever (RMSF) is an ongoing public health crisis in Mexico, particularly in states bordering the United States. The national highest incidence and mortality of RMSF occur in this region, resulting in a case-fatality rate that ranges annually between 10% and 50%, primarily affecting vulnerable groups such as children, elderly a...

Gut metagenome in pediatric subjects with metabolic syndrome (MetS) and type-2 diabetes mellitus (T2DM) has been poorly studied, despite an alarming worldwide increase in the prevalence and incidence of obesity and MetS within this population. The objective of this study was to characterize the gut microbiome taxonomic composition of Mexican pediat...

Background Childhood obesity is a serious public health concern that confers a greater risk of developing important comorbidities such as MetS and T2DM. Recent studies evidence that gut microbiota may be a contributing factor; however, only few studies exist in school-age children. Understanding the potential role of gut microbiota in MetS and T2DM...

The prevalence of type 2 diabetes mellitus (T2DM) and metabolic syndrome (MetS) has increased in the pediatric population. Irisin, an adipomyokine, is involved in white adipose tissue browning, energy expenditure, insulin sensitivity, and anti-inflammatory pathways. Data on the associations among circulating irisin levels, soluble cell adhesion mol...

Background During the COVID-19 pandemic, there were noticeable changes in the number of admissions to paediatric emergency departments (EDs) worldwide, as well as in the patient’s diagnoses. There is scarce evidence about the impact of the pandemic on paediatric EDs in Latin America and Mexico. This study aimed to analyse the changes in volume and...

Background Candida infections are increasingly recognized as clinically relevant pathogens in NICUs, particularly among preterm and low birth-weight infants (LBWI). Due to the emergence of Fluconazole-resistant Candida spp, current treatment guidelines of neonatal invasive Candidiasis (IC) suggest Amphotericin B as first line therapy, leaving Fluco...

Background Rocky Mountain Spotted Fever (RMSF) is a bacterial vector-borne disease transmitted through infected ticks. Northern Mexico is currently experiencing an alarming rise of RMSF cases associated with high mortality, affecting the pediatric population. Geographic Information Systems (GIS) characterize geotemporal trends of infectious disease...

Background Group B Streptococcus (GBS), or S. agalactiae, is reported as a leading cause of neonatal sepsis in several regions including the United States. Although in recent years its incidence has shown a steady decline, current treatment guidelines still consider it a predominant cause of neonatal sepsis. Its prevalence varies according to geogr...

Background The 2022 "TB Global Report" documents a rise of Tuberculosis (TB) cases worldwide and emphasizes the importance of surveillance strategies. Geographic Information Systems (GIS) characterize geo-temporal trends of communicable diseases and assist in decision-making, including resource allocation. The use of GIS in pediatric TB is limited...

Background Neonatal sepsis is a significant cause of morbidity and mortality in newborns. Etiology depends on multiple factors, particularly regional epidemiology. Current international guidelines are based on data from developed countries, which may not reflect the situation of developing regions. Microbiological surveillance in Mexican NICUs is l...

Background The growing threat of antimicrobial resistance is associated with the overprescription of broad-spectrum antibiotics. Antimicrobial stewardship programs (ASP) promote the responsible use of antibiotics. Their successful implementation requires adequate infrastructure and interdisciplinary efforts. ASPs in Mexico (Mx) are still scarce, pa...

Meet The Expert presentation at the 2024 ESPID Meeting, discussing the use of IVIG in two cases of Parechovirus infection

Poster describing a pericardial coccidioidomycosis, presented in less than 1% of extrapulmonary cases.

Background Analyzing the epidemiology and clinical manifestations of pediatric tuberculosis in endemic regions is crucial to meet the goal of ending tuberculosis. The objective was to assess the various clinical scenarios of tuberculosis in a large pediatric cohort in Mexico. Methods This retrospective study from a pediatric referral center in Mex...

Langerhans-cell histiocytosis (LCH) is a condition characterized of an inadequate function and proliferation of this cells. Clinical presentation can be variable depending on the site of affection. The most common sites of affection are bones, skin and lymph nodes; however, this histiocytic disorder can arise in virtually any organ system, making i...

Congenital mixed hiatal hernia is a disorder that combines features of both sliding and paraoesophageal hernias. The precise incidence of congenital mixed hiatal hernia during the pediatric and neonatal period remains uncertain, making diagnosis challenging within this age cohort. This case presents a 15‐day‐old female with an 8% postnatal weight l...

Background During the first months of the COVID-19 pandemic, a reduction in the volume of patients who sought care in pediatric emergency departments (ED) was observed. An apparent change in discharge diagnoses was also witnessed. There is scarce evidence about the impact of the pandemic on pediatric emergency departments in Mexico and Latin Americ...

Background An unprecedented rise in rickettsiosis cases is occurring in Nuevo Leon (NL), Mexico. A total of 73 cases have been identified since Jan 2022, as opposed to 2021, when 13 cases occurred. Despite multidisciplinary efforts, the current outbreak is still ongoing. Early treatment with doxycycline is crucial to avoid devastating outcomes. Fig...

Beginning in 2022, Nuevo Leon, Mexico, experienced an outbreak of rickettsioses that is still ongoing despite multidisciplinary control efforts. A total of 57 cases have been confirmed, particularly affecting children. We report a high mortality rate among hospitalized persons in Nuevo Leon. Continuing efforts are required to control the outbreak.

Objectives The aim of the study is to determine if there is an association between altered biomarkers and cardiovascular involvement in Latin American patients with MIS-C. Design The researchers of this study conducted a retrospective cohort study. Setting Secondary care maternal unit hospital in Monterrey, NL, Mexico. Participants Any register...

Background Tuberculosis (TB) is a disease caused by Mycobacterium tuberculosis complex, mainly by M. tuberculosis. Annually, 1 million children develop TB disease and many more present a latent form of infection. The objective of this study is to define the epidemiological trends of the different clinical presentations of TB in pediatric population...

Background S. aureus is the most common cause of osteomyelitis in children. Panton-Valentine leucocidin (PVL) is an exotoxin produced by certain S. aureus strains, which can be detected in both methicillin-sensitive and -resistant strains of staphylococci. Pediatric osteomyelitis by PVL producing S. aureus constitute a rare, but highly critical eve...

Multisystem inflammatory syndrome in children (MIS-C) is an emerging entity during the coronavirus disease 2019 pandemic. Medium- and large-vessel changes are present in MIS-C; however, microcirculatory impairment has not been documented. We report a case of MIS-C in a toddler that presented with persistent fever, gastrointestinal symptoms and rash...

Background Tuberculosis (Tb) is a leading cause of death worldwide. The most common cause of Tb is due to M. tuberculosis, however, M. bovis is considered a public health issue and an often-undetected cause of Tb. Information regarding Tb by M. bovis in children is scarce. Methods Retrospective analysis of culture-proven cases of Tb by M. bovis fr...

Proinflammatory cytokines and the novel myokine irisin, a cleavage product of FNDC5, have been found to play a role in obesity and type 2 diabetes mellitus (T2DM). Irisin has been shown to increase browning of adipose tissue, thermogenesis, energy expenditure, and insulin sensitivity, yet its association with inflammatory markers is still limited....

1. Oscar Tamez-Rivera, MD* 2. Nataly Mercado, MD* 3. Amarante Gutierrez-Martin, MD* 1. *Department of Pediatrics, Escuela de Medicina del Tecnologico de Monterrey, Monterrey, Mexico A previously healthy 4-year-old girl presents with a 2-day history of malaise and fever. One day ago, the patient complained of painful swallowing and refused to eat...

Introduction: The growing elderly population of HIV-infected patients is leading to a significant epidemiological transition and HIV infection has been proposed as a premature and accelerated aging model rending the individual more susceptible to premature disability. However, the determinants of disability among this emergent population are still...

Background: The phenotype of frailty proposed by Fried et al has shown to predict several adverse health-related outcomes in elderly populations worldwide; however, the description of such associations in Latin America is still scarce. Objective: To describe the association between frailty and recent hospitalization, disability for basic (ADL) and...

An epidemiological transition is occurring regarding Human Immunodeficiency Virus (HIV) infection. This phenomenon, explained by several mechanisms (e.g.: physiologic changes, pharmacologic advances, sexual behaviors), is demonstrated by a significant increase in the number of patients aged 50 years and older diagnosed with this infection. The immu...