Selection of Antimicrobial Agents for Severe Sepsis

Worldwide, sepsis remains the leading cause of death among infants and children, with an estimated 1.6 million pediatric deaths annually. Although our understanding of the pathophysiology of sepsis has deepened over the past two decades, advances in research have not yet been translated into clinically effective practice. Currently, treatment of sepsis still relies primarily on anti-infective strategies and comprehensive supportive care, with timely and appropriate antibiotic use closely linked to patient outcomes. 1. The Role of Antibiotics in the Management of Sepsis Sepsis is, in essence, the host’s response to invasion by exogenous pathogens; without infection, sepsis cannot occur. Conversely, without the host’s defensive response to pathogen entry…

Prioritizing blood cultures can help slow the emergence of bacterial resistance.

Bloodstream infections are common in clinical practice and are associated with a high mortality rate. At present, many hospitals still lag significantly behind advanced institutions in Europe and North America in the area of blood culture. Several factors contribute to the limited adoption of blood cultures; chief among them are the high costs of specimen submission and the lack of standardized procedures for sample collection. Therefore, it is imperative to promptly establish reasonable, nationally appropriate fee schedules for blood cultures and to standardize sampling practices. Blood collection during the early phase of fever—many factors influence the yield of blood cultures, including the timing of blood draw, the number of culture bottles used, and the volume of blood cultured. Studies have shown that, prior to chills and fever, bacteria enter the bloodstream in large numbers within one hour, and during the febrile phase…

Blood Cultures: Common Clinical Issues and Management Strategies

Bloodstream infection (BSI) refers to an infection in which pathogenic microorganisms invade the bloodstream and disseminate throughout the body, manifesting as bacteremia, fungemia, viremia, or sepsis. BSI is a systemic infectious disease; in severe cases, it may lead to shock, disseminated intravascular coagulation, and multiple organ failure. Catheter-related bloodstream infection (CRBSI) is defined as bacteremia or fungemia occurring in a patient with an indwelling vascular catheter, or within 48 hours after removal of such a catheter, accompanied by clinical signs of infection—such as fever (>38°C), chills, or hypotension—with no other identifiable source of infection apart from the catheter. For patients suspected of having BSI or CRBSI…

An Investigation into the Factors Affecting Gram Staining

Discussion on Factors Affecting Gram Staining The Gram staining method is one of the most classic and widely used differential staining techniques in bacteriology, first developed by the Danish bacteriologist Christian Gram. It typically involves four steps: primary staining, mordanting, decolorization, and counterstaining. The specific procedure is as follows: fix the smear; stain with crystal violet for 1 minute, then rinse with tap water; apply iodine solution to cover the smear and stain for 1 minute; wash with water and blot dry with absorbent paper; add a few drops of 95% ethanol and gently shake to decolorize; after 30 seconds, rinse with water and blot dry; finally, stain with diluted safranin for 30 seconds, rinse with tap water, allow to dry, and examine under the microscope. Staining.

Analysis of Conflicts Between the Clinical Department and the Laboratory Department, and Corresponding Countermeasures

Clinical microbiology testing involves lengthy turnaround times, from sample collection to report issuance—typically 2–3 days for routine tests and up to the seventh day for blood cultures before a negative result can be reported. Additionally, the antimicrobial susceptibility test (AST) reports sometimes recommend drugs that do not align with clinicians’ prescribing practices, and treatment outcomes based on laboratory results are often suboptimal. These issues frequently give rise to dissatisfaction among clinical departments toward the laboratory. Meanwhile, the laboratory, in turn, often faces criticism from clinical teams due to the inability to obtain adequate specimens, which directly compromises test accuracy. The lack of effective communication thus fosters conflict between clinical and laboratory services. This paper seeks to analyze the underlying factors contributing to these tensions.

Interpretation of SDD in the 2014 CLSI M100-S24 Update

Establishing standardized operating procedures for pathogen identification and in vitro antimicrobial susceptibility testing is one of the fundamental requirements for strengthening the capacity of microbiology laboratories. This is of significant practical importance for optimizing clinical drug selection, enhancing the diagnosis and treatment of infectious diseases, and addressing the emergence of drug‑resistant pathogens. The antimicrobial susceptibility testing standards developed by the Clinical and Laboratory Standards Institute (CLSI) serve as a guiding document that Chinese laboratories are expected to follow. In 2014, these standards introduced, for the first time, the concept of “dose‑dependent susceptibility (SDD)” in the context of Enterobacteriaceae susceptibility testing, thereby improving the accuracy of susceptibility reports, preventing clinicians from misinterpreting “intermediate” results as “resistant,” and promoting the rational use of antimicrobial agents.