[Antibiotic resistance and community-acquired infections]

Roberto Manfredi1

  • 1Dipartimento di Medicina Clinica Specialistica e Sperimentale, Alma Mater Studiorum Università di Bologna, Policlinico S. Orsola-Malpighi, Bologna. manfredi@.med.unibo.it

Insights

Rising antibiotic resistance in common bacteria necessitates careful drug use. Judicious administration of existing antimicrobials and reduced overprescription are key to managing infections.

Area of Science:

  • Microbiology and Infectious Diseases
  • Pharmacology
  • Epidemiology

Background:

  • Extended broad-spectrum antibiotic use drives selection of resistant gram-positive and gram-negative organisms.
  • Unpredictable in vitro antimicrobial susceptibility challenges current first-line treatments.

Purpose of the Study:

  • To examine the growing challenge of antimicrobial resistance from multiple perspectives.
  • To identify strategies for managing common community-acquired infections amidst evolving resistance patterns.

Main Methods:

  • Epidemiological analysis of resistance trends.
  • Microbiological assessment of organism susceptibility.
  • Therapeutic and pharmacoeconomic evaluation of treatment strategies.

Main Results:

  • Common pathogens exhibit unpredictable susceptibility to existing antibiotics.
  • Multiple variables contribute to the changing resistance landscape.

Conclusions:

  • New antibiotic development is not the sole solution.
  • Rational, judicious use of current antimicrobial agents is crucial.
  • Enhanced medical and patient interaction to prevent overprescription is essential.

Related Concept Videos

Antibiotic Selection00:57

Antibiotic Selection

Overview
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
Microbiota Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...