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Questions and Answers

What is the primary treatment initiated for severe COVID-19 pneumonia in this case?

  • Monoclonal antibodies
  • Interferon therapy
  • Intravenous dexamethasone and tocilizumab (correct)
  • Combination antiretroviral therapy
  • Which type of virus requires transcription to a positive strand before protein translation?

  • Positive-sense ssRNA virus
  • Negative-sense ssRNA virus (correct)
  • Retrovirus
  • dsDNA virus
  • Which laboratory finding is noted in the 32-year-old woman suspected of having acute HIV infection?

  • Increased platelet count
  • Lymphocytopenia (correct)
  • Elevated white blood cell count
  • Normal serum sodium levels
  • Which structural classification of viruses includes a head-tail structure?

    <p>Complex Viruses</p> Signup and view all the answers

    What stage of HIV infection is indicated by the serology results in the case of the 32-year-old woman?

    <p>Fiebig stage 3</p> Signup and view all the answers

    What is the primary function of the viral envelope in enveloped viruses?

    <p>To facilitate binding to host cell receptors</p> Signup and view all the answers

    What potential concern does the patient with HIV express regarding the initiation of treatment?

    <p>Desire to see if her immune system can clear the infection</p> Signup and view all the answers

    Which treatment option is part of the deliberation for the management of severe COVID-19 pneumonia in this case?

    <p>Convalescent plasma therapy</p> Signup and view all the answers

    Which of the following viruses is correctly classified as a naked capsid virus?

    <p>Poliovirus</p> Signup and view all the answers

    Among these options, which virus utilizes reverse transcription to integrate its genetic material into the host genome?

    <p>HIV</p> Signup and view all the answers

    Which class in the Baltimore Classification consists of double-stranded RNA viruses?

    <p>Class III</p> Signup and view all the answers

    Which of the following viruses is classified as a negative-sense single-stranded RNA virus?

    <p>Influenza</p> Signup and view all the answers

    What type of structure do helical viruses have?

    <p>Filamentous or rod-like shapes</p> Signup and view all the answers

    What defines true pathogens in relation to immune competence?

    <p>They possess virulence factors that enable them to cause disease in healthy individuals.</p> Signup and view all the answers

    Which mechanism is commonly used by true pathogens to damage host tissues?

    <p>Utilizing toxins or invasion proteins.</p> Signup and view all the answers

    Which virus is categorized as a Class VII virus in the Baltimore Classification?

    <p>Hepatitis B Virus</p> Signup and view all the answers

    Which type of viruses are known to infect various animal species, including humans?

    <p>Animal Viruses</p> Signup and view all the answers

    Under which condition can opportunistic pathogens cause disease?

    <p>When the host immunity is compromised.</p> Signup and view all the answers

    What characteristic defines icosahedral viruses?

    <p>Capsid made of 20 triangular faces</p> Signup and view all the answers

    What role do commensal bacteria play in the host?

    <p>They assist in digestion and prevent pathogen colonization.</p> Signup and view all the answers

    Which of the following examples is a helical virus?

    <p>Tobacco Mosaic Virus</p> Signup and view all the answers

    Which statement is true regarding the survival mechanisms of Mycobacterium tuberculosis?

    <p>It evades immune detection by surviving within macrophages.</p> Signup and view all the answers

    Which class of viruses includes those that utilize reverse transcriptase and are positive-sense single-stranded RNA viruses?

    <p>Class VI</p> Signup and view all the answers

    What condition is associated with the overgrowth of Clostridium difficile?

    <p>Prolonged antibiotic therapy.</p> Signup and view all the answers

    How does Staphylococcus epidermidis typically behave in a healthy individual?

    <p>It acts as a beneficial commensal bacterium.</p> Signup and view all the answers

    What kind of infections can certain strains of Escherichia coli cause in compromised hosts?

    <p>Urinary tract infections (UTIs).</p> Signup and view all the answers

    What is a characteristic of Gram-positive bacteria that affects their susceptibility to antibiotics?

    <p>Absence of an outer membrane</p> Signup and view all the answers

    Which of the following bacteria is known to be generally non-pathogenic but can cause infections in individuals with weakened immune systems?

    <p>Staphylococcus epidermidis</p> Signup and view all the answers

    What role do Lactobacillus species play in the gastrointestinal and genitourinary tracts?

    <p>They produce lactic acid to maintain an acidic environment</p> Signup and view all the answers

    What is the primary effect of the lipopolysaccharide (LPS) component found in Gram-negative bacteria?

    <p>It acts as a powerful endotoxin</p> Signup and view all the answers

    What structural feature distinguishes the cell wall of Gram-negative bacteria?

    <p>A thin peptidoglycan layer with an outer membrane</p> Signup and view all the answers

    Which of the following describes the mechanism by which Gram-positive bacteria assist in wound healing?

    <p>By forming an acidic barrier against pathogens</p> Signup and view all the answers

    Which of these statements about supercoiled DNA in bacteria is true?

    <p>It is found in the cytoplasm within the nucleoid</p> Signup and view all the answers

    What type of infections can Staphylococcus aureus cause?

    <p>A variety of infections, including skin and systemic diseases</p> Signup and view all the answers

    Which of the following describes the role of beta-lactamases in bacterial resistance?

    <p>They hydrolyze the beta-lactam ring in various antibiotics.</p> Signup and view all the answers

    Which class of beta-lactamases can hydrolyze carbapenems?

    <p>Class B Beta-lactamases</p> Signup and view all the answers

    What is the primary function of aminoglycoside-modifying enzymes?

    <p>To prevent aminoglycosides from binding to ribosomal subunits.</p> Signup and view all the answers

    How do bacteria acquire resistance genes aside from intrinsic resistance?

    <p>By horizontal gene transfer or mutations.</p> Signup and view all the answers

    Which mechanism is NOT typically involved in bacterial virulence?

    <p>Inhibition of bacterial ribosomal function.</p> Signup and view all the answers

    What type of enzymes inactivate chloramphenicol?

    <p>Chloramphenicol acetyltransferase</p> Signup and view all the answers

    What enables bacteria to form biofilms, providing protection against the immune system?

    <p>Adhesion molecules</p> Signup and view all the answers

    In bacterial infections, the understanding of virulence factors is important for which purpose?

    <p>Creating targeted therapies and preventive measures.</p> Signup and view all the answers

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