[Association between influenza vaccination and mortality due to COVID-19].

Background: It has recently been suggested that influenza vaccination may be a factor associated with decreased COVID-19 mortality.

Methods: An age-matched case-control study based on hospital cases. We included subjects aged 18 years and older with a diagnosis of moderate to severe COVID-19.

COVID-19 epidemiology in a Mexican tertiary care hospital.

Introduction: As a result of COVID-19, many hospitals underwent a conversion for the care for this disease.

Objective: To analyze COVID-19 hospital epidemiological behavior from March to August 2020.

Methods: Through a series of cases, COVID-19 epidemiological behavior at the hospital was analyzed, for which simple case rates, percentages and incidence of COVID-19 per 100 hospital discharges were estimated.

Decrease of Postchemotherapy Complications With the Use of Probiotics in Children With Acute Lymphoblastic Leukemia.

Introduction: During the administration of antineoplastic drugs, acute complications because of toxicity occur, determining their hospital readmission, visits to the emergency department, use of antimicrobials, and possibilities of presenting systemic infections, impacting on their life quality.

Methods: Through a prospective cohort, 60 children with acute lymphoblastic leukemia were followed-up for 30 days after the hospital discharge because of chemotherapy administration, those patients were previously included in a single-blinded study in which 30 (group 1) received Lactobacillus rhamnosus GG probiotic during the administration of chemotherapy. The remaining 30 patients did not receive probiotics (group 2).

Opportunities in the teaching of medical specialties, regarding influenza and COVID-19.

Medical specialties' teaching is an area of health systems that deserves special consideration in light of the lessons learned from influenza and COVID-19; educational programs and implementation of the training strategies that are used must be reevaluated, since the level of training of most specialty students does not allow to consider them as personnel who can face these global problems. The number of specialization courses has exponentially grown, and their main threat is the cancellation or partial execution of their academic programs as a consequence of not implementing functional operational strategies during a contingency.