Medicine
Infectious Disease
Which malaria species is most strongly associated with severe multiorgan disease and cerebral malaria?
A. Plasmodium ovale only
B. Plasmodium malariae only
C. Plasmodium falciparum
D. Babesia microti
Correct Answer: C
P. falciparum is the species most associated with severe and life-threatening malaria.
Medicine
Infectious Disease
Which complication or major adverse outcome is particularly associated with Falciparum malaria?
A. Sensorineural hearing loss
B. Cerebral malaria
C. Urosepsis
D. Necrotizing soft-tissue infection
Correct Answer: B
Severe falciparum malaria can cause encephalopathy, seizures and coma.
Medicine
Infectious Disease
A patient is diagnosed with Falciparum malaria. Which is the most appropriate management principle?
A. Use species- and severity-appropriate antimalarial therapy; severe malaria requires urgent parenteral treatment
B. Use specialist-guided antiviral therapy for patients meeting treatment criteria and perform appropriate liver-cancer surveillance in at-risk groups
C. Start prompt age- and risk-appropriate empiric intravenous antibiotics with adjunctive dexamethasone when indicated
D. Give appropriate antimicrobial therapy based on severity, local resistance and patient risk; admit if unstable or unable to tolerate oral therapy
Correct Answer: A
Falciparum malaria can deteriorate rapidly and treatment should follow current regional or international guidance.
Medicine
Infectious Disease
In a patient with suspected Falciparum malaria, which investigation or diagnostic approach is most appropriate at this stage?
A. Stool testing using an accepted C. difficile diagnostic algorithm in a patient with clinically significant diarrhea
B. HBV serology, HBV DNA, liver assessment and evaluation for coinfections
C. Blood cultures and lumbar puncture when safe, without delaying empiric therapy in a critically ill patient
D. Urgent malaria testing with thick and thin blood films or validated rapid testing, repeated if initial testing is negative but suspicion remains
Correct Answer: D
Prompt parasitologic diagnosis and species identification guide treatment and severity assessment.
Medicine
Infectious Disease
A patient returns from a malaria-endemic area with fever, chills, thrombocytopenia and no alternative source. What is the most likely diagnosis?
A. Human immunodeficiency virus (HIV) infection
B. Clostridioides difficile infection
C. Falciparum malaria
D. Chronic hepatitis B infection
Correct Answer: C
Travel-associated undifferentiated fever should include malaria, especially falciparum malaria, in the differential.
Medicine
Infectious Disease
Which infection-control measure is especially important for C. difficile because spores persist in the environment?
A. Airborne isolation only
B. Contact precautions with effective sporicidal environmental cleaning
C. No environmental cleaning is needed
D. Routine surgical mask alone
Correct Answer: B
C. difficile forms hardy spores, so contact precautions and sporicidal cleaning are important.
Medicine
Infectious Disease
Which complication or major adverse outcome is particularly associated with Clostridioides difficile infection?
A. Toxic megacolon
B. Necrotizing soft-tissue infection
C. Hemoptysis
D. Opportunistic infection with advanced immunosuppression
Correct Answer: A
Fulminant C. difficile colitis can cause ileus, toxic megacolon, perforation and shock.
Medicine
Infectious Disease
A patient is diagnosed with Clostridioides difficile infection. Which is the most appropriate management principle?
A. Give appropriate antimicrobial therapy based on severity, local resistance and patient risk; admit if unstable or unable to tolerate oral therapy
B. Use antimicrobial therapy targeting likely skin flora and address the portal of entry
C. Use a guideline-based multidrug antituberculous regimen under appropriate public-health supervision
D. Stop unnecessary precipitating antibiotics and use recommended C. difficile-directed therapy based on severity and recurrence
Correct Answer: D
Treatment depends on episode severity and recurrence history, and infection-control measures are important.
Medicine
Infectious Disease
In a patient with suspected Clostridioides difficile infection, which investigation or diagnostic approach is most appropriate at this stage?
A. Blood cultures and lumbar puncture when safe, without delaying empiric therapy in a critically ill patient
B. Urinalysis and urine culture
C. Stool testing using an accepted C. difficile diagnostic algorithm in a patient with clinically significant diarrhea
D. Clinical diagnosis in uncomplicated cases; imaging is reserved for suspected abscess, deep infection or alternative diagnoses
Correct Answer: C
Testing should be limited to symptomatic patients because colonization can produce positive tests without disease.
Medicine
Infectious Disease
A patient develops new significant diarrhea after recent antibiotic exposure and hospitalization. What is the most likely diagnosis?
A. Chronic hepatitis B infection
B. Clostridioides difficile infection
C. Acute bacterial meningitis
D. Acute pyelonephritis
Correct Answer: B
Antibiotic-associated diarrhea with compatible risk factors should raise suspicion for C. difficile infection.
Medicine
Infectious Disease
What is the main goal of effective antiretroviral therapy?
A. Durable suppression of HIV replication with immune recovery
B. Temporary symptom relief without viral suppression
C. Eradication of all latent virus after one dose
D. Avoidance of all vaccinations
Correct Answer: A
Sustained viral suppression preserves immunity, reduces morbidity and dramatically lowers transmission risk.
Medicine
Infectious Disease
Which complication or major adverse outcome is particularly associated with Human immunodeficiency virus (HIV) infection?
A. Toxic megacolon
B. Cerebral malaria
C. Cirrhosis and hepatocellular carcinoma
D. Opportunistic infection with advanced immunosuppression
Correct Answer: D
Progressive untreated HIV impairs cellular immunity and predisposes to opportunistic disease.
Medicine
Infectious Disease
A patient is diagnosed with Human immunodeficiency virus (HIV) infection. Which is the most appropriate management principle?
A. Use a guideline-based multidrug antituberculous regimen under appropriate public-health supervision
B. Stop unnecessary precipitating antibiotics and use recommended C. difficile-directed therapy based on severity and recurrence
C. Start effective combination antiretroviral therapy and address opportunistic-infection prevention and treatment
D. Use species- and severity-appropriate antimalarial therapy; severe malaria requires urgent parenteral treatment
Correct Answer: C
Antiretroviral therapy improves immune recovery, survival and transmission prevention.
Medicine
Infectious Disease
In a patient with suspected Human immunodeficiency virus (HIV) infection, which investigation or diagnostic approach is most appropriate at this stage?
A. Clinical diagnosis in uncomplicated cases; imaging is reserved for suspected abscess, deep infection or alternative diagnoses
B. Laboratory HIV antigen/antibody testing with confirmatory testing according to the diagnostic algorithm
C. Microbiologic testing of respiratory specimens with rapid molecular testing and culture
D. Stool testing using an accepted C. difficile diagnostic algorithm in a patient with clinically significant diarrhea
Correct Answer: B
Modern algorithms begin with combined antigen/antibody testing and use supplemental assays to confirm infection.
Medicine
Infectious Disease
A patient has recurrent opportunistic infections and risk factors for HIV exposure. What is the most likely diagnosis?
A. Human immunodeficiency virus (HIV) infection
B. Acute pyelonephritis
C. Nonpurulent cellulitis
D. Pulmonary tuberculosis
Correct Answer: A
Risk-based or routine screening can identify HIV before advanced disease; opportunistic infections raise urgency.
Medicine
Infectious Disease
Which infection-control precaution is appropriate for suspected infectious pulmonary TB in a healthcare setting?
A. Contact precautions only
B. No precautions once a chest X-ray is ordered
C. Droplet precautions only in every case
D. Airborne precautions
Correct Answer: D
Pulmonary TB spreads through airborne particles and requires airborne infection-control measures.
Medicine
Infectious Disease
Which complication or major adverse outcome is particularly associated with Pulmonary tuberculosis?
A. Cirrhosis and hepatocellular carcinoma
B. Sensorineural hearing loss
C. Hemoptysis
D. Urosepsis
Correct Answer: C
Cavitary or destructive pulmonary TB can erode vessels and cause clinically significant hemoptysis.
Medicine
Infectious Disease
A patient is diagnosed with Pulmonary tuberculosis. Which is the most appropriate management principle?
A. Use species- and severity-appropriate antimalarial therapy; severe malaria requires urgent parenteral treatment
B. Use a guideline-based multidrug antituberculous regimen under appropriate public-health supervision
C. Use specialist-guided antiviral therapy for patients meeting treatment criteria and perform appropriate liver-cancer surveillance in at-risk groups
D. Start prompt age- and risk-appropriate empiric intravenous antibiotics with adjunctive dexamethasone when indicated
Correct Answer: B
TB requires combination therapy to cure disease and prevent emergence of resistance.
Medicine
Infectious Disease
In a patient with suspected Pulmonary tuberculosis, which investigation or diagnostic approach is most appropriate at this stage?
A. Microbiologic testing of respiratory specimens with rapid molecular testing and culture
B. Stool testing using an accepted C. difficile diagnostic algorithm in a patient with clinically significant diarrhea
C. Urgent malaria testing with thick and thin blood films or validated rapid testing, repeated if initial testing is negative but suspicion remains
D. HBV serology, HBV DNA, liver assessment and evaluation for coinfections
Correct Answer: A
Microbiologic confirmation and drug-resistance assessment are central to modern TB diagnosis.
Medicine
Infectious Disease
A patient has chronic cough, weight loss, night sweats and an upper-lobe cavitary pulmonary lesion. What is the most likely diagnosis?
A. Human immunodeficiency virus (HIV) infection
B. Clostridioides difficile infection
C. Falciparum malaria
D. Pulmonary tuberculosis
Correct Answer: D
Chronic constitutional and respiratory symptoms with compatible imaging should prompt evaluation for pulmonary TB.