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Bacterial Phylum Tenericutes01:24

Bacterial Phylum Tenericutes

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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...
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The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic...
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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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The accessory ducts involved in sperm maturation and transportation include the epididymides, vasa deferentia, ejaculatory ducts, and urethra. These ducts play a critical role in the maturation, storage, and transportation of sperm from the testes to the urethra, where it is then released during ejaculation.
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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Let's not forget about Mycoplasma genitalium.

Jeffrey D Jenks1,2

  • 1Durham County Department of Public Health, Durham, NC, USA.

Sexual Health
|November 19, 2025
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Doxycycline pre-exposure prophylaxis (Doxy-PEP) may increase antimicrobial resistance in Mycoplasma genitalium. Surveillance of M. genitalium antibiotic resistance is crucial as Doxy-PEP use expands for STI prevention.

Keywords:
Chlamydia trachomatisDoxy PEPMycoplasma genitaliumNeisseria gonorrhoeaeantibiotic resistancedoxycycline post-exposure prophylaxisresistance testingsexually transmitted infections

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Area of Science:

  • Public Health
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Doxycycline pre-exposure prophylaxis (Doxy-PEP) is a strategy to prevent sexually transmitted infections (STIs), particularly among men who have sex with men.
  • Concerns exist regarding the potential for increased antimicrobial resistance with widespread Doxy-PEP use.
  • Mycoplasma genitalium is a pathogen frequently treated with doxycycline and is prone to developing resistance.

Purpose of the Study:

  • To analyze the public health ethics surrounding Doxy-PEP.
  • To highlight the potential impact of Doxy-PEP on antimicrobial resistance.
  • To emphasize the need for surveillance of Mycoplasma genitalium antibiotic resistance.

Main Methods:

  • Literature review and ethical analysis of Doxy-PEP.
  • Discussion of antimicrobial resistance patterns related to tetracyclines.
  • Examination of Mycoplasma genitalium's susceptibility to doxycycline.

Main Results:

  • Doxy-PEP may contribute to the rise of tetracycline-resistant pathogens.
  • Mycoplasma genitalium resistance to doxycycline is a significant concern.
  • Increased Doxy-PEP use necessitates proactive resistance monitoring.

Conclusions:

  • Antimicrobial resistance surveillance in Mycoplasma genitalium must be prioritized.
  • The ethical implementation of Doxy-PEP requires careful consideration of resistance.
  • Balancing STI prevention with antimicrobial stewardship is essential.