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Clinical Significance of Antibiotic Resistance01:25

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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...
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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity,...
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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...
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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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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...
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Antibiotic use and its consequences for the normal microbiome.

Martin J Blaser1

  • 1Division of Translational Medicine, Department of Medicine, New York University Langone Medical Center (NYULMC), New York, NY 10016, USA. Department of Microbiology, NYULMC, New York, NY 10016, USA. Department of Veterans Affairs New York Harbor Medical Center, New York, NY 10010, USA.

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Summary

Antibiotics impact both individual and community health by treating infections and preventing spread. However, they also drive resistance and harm the body's beneficial microbiome, impacting personal health.

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Area of Science:

  • Microbiology
  • Pharmacology
  • Public Health

Background:

  • Anti-infectives, particularly antibiotics, uniquely affect both individual patients and the wider community.
  • Their use intersects personal health benefits with public health considerations, including the spread of infectious agents.
  • Antibiotic resistance, a known consequence, increasingly limits treatment options for severe infections.

Purpose of the Study:

  • To elucidate the multifaceted impacts of antibiotic use.
  • To highlight the previously underappreciated "fourth edge" of antibiotic action: collateral damage to the human microbiome.
  • To emphasize the importance of the microbiome, especially in early life.

Main Methods:

  • Conceptual analysis of antibiotic effects.
  • Review of historical and recent scientific understanding of antibiotics.
  • Discussion of the "four-edged sword" analogy for antibiotic impact.

Main Results:

  • Antibiotics provide individual and community benefits by combating infections.
  • Antibiotic resistance poses a significant and growing threat to public health.
  • Antibiotics cause collateral damage to the host microbiome, negatively impacting individual health.

Conclusions:

  • The full impact of antibiotics encompasses individual treatment, community health, resistance development, and microbiome disruption.
  • Understanding the "fourth edge" of antibiotic action on the microbiome is crucial for comprehensive health strategies.
  • The symbiotic relationship with the microbiome, vital for health, is particularly sensitive during early development and susceptible to antibiotic-induced damage.