305 week 9 superbugs

What is antibiotic resistance?

The ability of bacteria to survive or continue growing despite exposure to antibiotics that would normally kill them or inhibit their growth.

What warning did Alexander Fleming give about antibiotic resistance?

Inappropriate antibiotic use, particularly taking doses that are too low, can expose microbes to non-lethal drug concentrations and encourage resistance.

What are broad-spectrum antibiotics?

Antibiotics active against many different types of bacteria.

What is a disadvantage of broad-spectrum antibiotics?

They can affect both harmful bacteria and normal flora.

What are the main targets of antibiotics?

Cell wall synthesis, cell membrane function, protein synthesis, DNA and RNA synthesis, and metabolic pathways such as folate synthesis.

Which antibiotic class targets bacterial cell wall synthesis?

Penicillins.

Which antibiotic class targets folate synthesis?

Sulfonamides.

Which antibiotic class targets DNA synthesis?

Fluoroquinolones.

Which antibiotic class inhibits protein synthesis?

Tetracyclines.

What are five mechanisms bacteria use to resist antibiotics?

Destroy the antibiotic with enzymes, pump it out using efflux pumps, prevent its entry, modify its target, or use an alternative metabolic pathway.

How can enzymes contribute to antibiotic resistance?

Bacteria can produce enzymes that destroy or inactivate an antibiotic.

What is an efflux pump?

A mechanism bacteria use to pump antibiotics out of the cell.

How can bacteria prevent antibiotics from working by changing their targets?

They modify the antibiotic's target so the drug can no longer bind or work effectively.

What is an alternative metabolic pathway in antibiotic resistance?

Bacteria use a different pathway to carry out a process that an antibiotic normally blocks.

What is horizontal gene transfer?

The transfer of genetic material between bacteria.

What is transformation?

Horizontal gene transfer in which bacteria take up DNA from their environment.

What is conjugation?

Direct transfer of plasmids between bacteria.

Why are plasmids important in antibiotic resistance?

They can carry multiple resistance genes and spread them between bacteria.

How can horizontal gene transfer contribute to multidrug resistance?

Resistance genes can spread rapidly between bacteria, and a single plasmid may carry genes for resistance to multiple antibiotics.

What is a multidrug-resistant organism?

An organism resistant to multiple antimicrobial drugs.

Why is antibiotic resistance a serious public health problem?

It reduces effective treatment options, prolongs illness, increases hospitalization, and raises the risk of complications.

What factors contribute to antibiotic resistance?

Antibiotic use for viral infections, unnecessary prescribing, inappropriate use, overuse of broad-spectrum antibiotics, spread of resistant organisms in healthcare settings, and antibiotic use in agriculture and animal production.

Why does using antibiotics to treat viral infections contribute to resistance?

Antibiotics do not treat viral infections, so their unnecessary use exposes bacteria to antibiotics and increases selective pressure for resistance.

How does unnecessary antibiotic prescribing contribute to resistance?

It exposes bacteria to antibiotics without sufficient clinical justification, increasing selective pressure for resistant organisms.

How can antibiotic use in agriculture and animal production contribute to resistance?

Antibiotic exposure can select for resistant bacteria that may spread.

How can resistant organisms spread in healthcare settings?

They can spread between patients and through contaminated surfaces or contact, depending on the organism.

What patient factors can contribute to antibiotic overuse?

Expecting antibiotics for viral illnesses, previous experiences with antibiotics, and wanting to return to work or school quickly.

What healthcare factors can contribute to antibiotic overuse?

Diagnostic uncertainty, time pressure, patient expectations, and prescribing antibiotics just in case.

How does antibiotic overuse increase resistance?

It causes unnecessary antibiotic exposure and greater selective pressure, increasing the likelihood that resistant bacteria will survive and spread.

Why does antibiotic dosing matter?

Antibiotics must maintain effective levels in the body to treat an infection successfully.

How can missed or delayed antibiotic doses affect treatment?

They can reduce treatment effectiveness and increase the risk of treatment failure or recurrence.

What should patients do to support effective antibiotic treatment?

Follow the prescribed dosing schedule.

What is MRSA?

Methicillin-resistant Staphylococcus aureus, a bacterium resistant to methicillin and related antibiotics.

What infections can MRSA cause?

Skin and soft-tissue infections, wound infections, pneumonia, and bloodstream infections.

How can MRSA spread?

Through direct contact with infected wounds or contaminated surfaces; it is common in healthcare settings.

What is VRE?

Vancomycin-resistant enterococci, including Enterococcus faecalis and Enterococcus faecium.

What infections can VRE cause?

Urinary tract infections, bloodstream infections, and surgical-site infections.

Where is VRE commonly encountered?

Hospitals and long-term care facilities, particularly among immunocompromised patients.

What are the key characteristics of Pseudomonas aeruginosa?

It is an opportunistic pathogen that is naturally resistant to many antibiotics and can adapt quickly to treatment.

What infections can Pseudomonas aeruginosa cause?

Pneumonia, urinary tract infections, and wound infections.

Who is at high risk for Pseudomonas aeruginosa infections?

Immunocompromised patients, ventilated patients, burn patients, and patients with cystic fibrosis.

What is Clostridioides difficile (C. difficile)?

An opportunistic bacterium found in the colon that can cause intestinal illness.

What are risk factors for C. difficile infection?

Recent antibiotic use, hospitalization, and residence in a long-term care facility.

What are the symptoms of C. difficile infection?

Watery diarrhea, abdominal cramping, fever, and colitis.

Why is recent antibiotic use a risk factor for C. difficile infection?

Antibiotics can disrupt normal intestinal flora, creating conditions that allow C. difficile to cause illness.

What is the normal role of Escherichia coli (E. coli)?

It is a common member of the normal intestinal flora.

What infections can E. coli cause?

Urinary tract infections, foodborne illness, bloodstream infections, and meningitis caused by some strains.

What disease is caused by Mycobacterium tuberculosis?

Tuberculosis.

Why is drug-resistant tuberculosis difficult to treat?

Treatment courses are long, and multidrug-resistant strains make treatment more complex and less effective.

Why is drug-resistant tuberculosis a major public health concern?

Resistance limits treatment options and increases the risk of transmission.

What is gonorrhea caused by?

Neisseria gonorrhoeae.

How is gonorrhea transmitted?

Through sexual contact.

Why is antibiotic-resistant gonorrhea concerning?

Resistance to multiple antibiotics reduces effective treatment options and creates a major public health concern.

What is Candida auris?

A fungus, not a bacterium, that can resist multiple antifungal medications and cause healthcare-associated outbreaks.

Why is Candida auris difficult to control in healthcare environments?

It can spread between patients and is difficult to eliminate from healthcare environments.

What infections can Candida auris cause?

Bloodstream infections, wound infections, and urinary tract infections.

What are pan-resistant organisms?

Organisms resistant to all or nearly all available antimicrobial agents.

Which organisms are listed as examples of possible pan-resistant organisms?

Some strains of Pseudomonas aeruginosa, Acinetobacter baumannii, and Klebsiella pneumoniae.

Why are pan-resistant organisms especially concerning?

They leave extremely limited treatment options and increase mortality and the burden on healthcare systems.

Why is antimicrobial stewardship important for controlling resistance?

It supports appropriate antimicrobial use and helps reduce the development and spread of resistance.

How might nanotechnology help treat resistant infections?

Research includes nanoparticle-assisted drug delivery, targeted antimicrobial therapies, and improving drug concentrations at infection sites.

What is the potential benefit of targeted antimicrobial therapy?

It may improve delivery of antimicrobial drugs to infection sites and help treat resistant organisms.

What novel approach to discovering antibiotics is described in the slides?

Encouraging bacteria to grow alongside other bacteria may stimulate them to produce toxins or antibiotics that kill competing bacteria.

How could competition between bacteria lead to new antibiotics?

Some bacteria may begin secreting previously unproduced antibiotics when grown with competing bacteria; these compounds could potentially be used against resistant bacteria.

What is the difference between antibiotic resistance and antifungal resistance?

Antibiotic resistance concerns drugs used against bacteria, whereas antifungal resistance concerns drugs used against fungi, such as Candida auris.

How do MRSA and VRE differ in their named resistance?

MRSA is resistant to methicillin; VRE is resistant to vancomycin.

How do MRSA and C. difficile differ?

MRSA is a methicillin-resistant bacterium that can cause skin, wound, respiratory, and bloodstream infections; C. difficile is associated with intestinal illness, especially after antibiotic use.

How do VRE and Pseudomonas aeruginosa differ in their resistance characteristics?

VRE is specifically resistant to vancomycin, whereas Pseudomonas aeruginosa is naturally resistant to many antibiotics and can adapt quickly to treatment.

What is the key distinction between C. auris and the other resistant organisms discussed?

Candida auris is a fungus resistant to antifungal medications, whereas the other organisms discussed are bacteria.

What is the relationship between antibiotic misuse, selective pressure, and resistance?

Misuse or overuse exposes bacteria to antibiotics unnecessarily, creating selective pressure that favors resistant bacteria.