Vol. 5 No. 1 (2023)

This issue of the journal addresses crucial topics in public health and medicine through four articles. First, it highlights the great complexity of the human gut and its vast bacterial microbiome. Second, it assesses knowledge about the BCG vaccine in Ecuador, revealing that a high percentage of mothers have a satisfactory level of proficiency, essential for preventing severe forms of tuberculosis. Third, it analyzes the impact of the pandemic on healthcare professionals, demonstrating a high prevalence of moderate to severe burnout syndrome among physicians and nurses at the Japanese University Hospital. Finally, the article reflects on the medical challenges of the twenty-first century, including antimicrobial resistance, oncological conditions, and highly contagious emerging pathogens such as the novel virus known as SARS-CoV-2.