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Introduction

  • Overview of logistics for upcoming lab sessions
  • Availability for student inquiries through phone calls or FaceTime for assistance

Lab Schedule and Inquiries

  • Friday Lab Session: Open lab will be held on Friday.Students encouraged to reach out with questions about lab work or unknown cultures.
  • Wednesday Lab: Jen will conduct lab on Wednesday at 02:24.
  • Need for Materials: Reminder for students to communicate their needs for lab materials or cultures before meeting.
  • Test Review: Tests will be brought to discuss results with students from Pramp and Winnemucca.
  • Technical Adjustments: Room setup should operate as usual; report any issues for troubleshooting.

Beta Proteobacteria

  • Overview of Pathogenic Groups: Continued discussion on beta proteobacteria focusing on notable genera.

Neisseria Genus

  • Neisseria Overview:
    • Possesses fimbriae to attach to mucous membranes of mammals causing infection.
    • Two primary human pathogens:
    • N. gonorrhoeae (Gonorrhea)
    • N. meningitidis (Meningitis)
N. gonorrhoeae (Gonorrhea)
  • Transmission:
    • Infection through mucosa of urogenital, oral, anal membranes, and conjunctiva of the eye.
    • Vertical transmission possible from mother to baby during childbirth, which could lead to conjunctivitis in infants.
  • Symptoms: Typically asymptomatic; can cause pelvic inflammatory disease (PID).
  • Treatment:
    • Historically treated with penicillin; resistance developed over time.
    • Treatment currently involves antibiotics.
N. meningitidis (Meningitis)
  • Overview: Causes bacterial meningitis; infection and swelling in the meninges of the brain and spinal cord.
  • Incidence: 40% of the population are asymptomatic carriers.
  • Symptoms Upon Infection:
    • Fever, severe headache, stiff neck (classic sign), and rapid progression to coma or death.
  • At-Risk Populations: Infants under 2 years old; college students in dorms.
  • Treatment: Early diagnosis and antibiotic treatment required. Possible complications include brain damage, hearing loss, and learning disabilities.
  • Vaccines: Vaccination campaigns targeted towards college students.

Gamma Proteobacteria

  • Overview of Characteristics: A diverse and large group with various shapes, metabolic types, and reproductive strategies organized into five main subgroups.

Subgroups of Gamma Proteobacteria

  1. Purple Sulfur Bacteria:
    • Obligate anaerobes; oxidize hydrogen sulfide to sulfur, producing sulfur granules instead of oxygen.
  2. Intracellular Pathogens:
    • Facultative intracellular parasites (can grow inside/outside host).
    • Notable genus: Legionella.
    • Legionella pneumophila: Causes Legionnaires' Disease, associated with contaminated water systems.
  3. Methane Oxidizers:
    • Utilize methane as their carbon source, contributing to environmental concerns due to greenhouse gases.
  4. Enterobacteriaceae Family:
    • Found in the intestinal tracts of humans/animals, many are pathogens. Includes:
      • E. coli, Salmonella, Shigella, Klebsiella, Yersinia, Erwinia, Enterobacter, Cronobacter.
  5. Specific Pathogens and Concerns:
    • E. coli: Commonly studied; serves as a contamination indicator. Potential for opportunistic infections and certain strains can be deadly (e.g., O157:H7).
    • Salmonella: Most species are pathogenic, often found in cold-blooded animals, particularly reptiles and poultry.
    • Typhoid Fever: Caused by Salmonella enterica; transmission through oral-fecal route.
    • Shigella: Causes shigellosis; results in diarrhea and dysentery. Highly infectious; primarily affects children under 5.
    • Yersinia: Includes Yersinia pestis (bubonic plague).
    • Cronobacter: Linked to infant formula recalls due to necrotizing enterocolitis in infants.
    • Clinical Implications: Most genera in gamma proteobacteria are associated with healthcare-related (nosocomial) infections.
    • Urinary Tract Infections: Specific species (e.g., Proteus mirabilis and Proteus vulgaris) often found in hospital infections.

Conclusion

  • Overview of discussions and material covered in beta and gamma proteobacteria.
  • Acknowledgment of the importance of understanding these pathogens for better prevention and treatment.
  • Brief mention of lab report due dates and academic scheduling.

Reminders

  • Students are encouraged to reach out with questions or for clarifications regarding laboratory work or course material.