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USMLE Micro-bio Latest Exam |Questions with 100% Correct Answers
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USMLE Micro-bio Latest Exam |Questions with 100% Correct Answers
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USMLE Micro-bio Latest Exam|Questions with 100% Correct Answers
Question
To confirm the diagnosis, what should be ordered?
1 Cellulose Tape Preparation
2 Harodo-Mari Technique
3 Urine Concentration
4 Baermann Technique
5 Modified Acid Fast Stain - ✔ ✔ enterobius vermicularis - scotch tape test
modified acid fast stain - cryptosporidium, will be red
urine concentration - shistosoma heamato
A 9-year-old leukemic undergoing chemotherapy begins to complain to nursing
that he has pain in his left elbow. You are notified, and upon physical examination
of the elbow joint you find it moderately inflamed with a distinct erythema. There
is limitation in flexion and extension of the arm due to the inflammation. It was
sensitive to the touch. A review of the patient's chart reveals no fevers,
,headaches, or chills. The patient's physical examination is unremarkable
considering his primary illness and therapeutic course.
Aspiration of the joint is performed, and fluid is sent to cytology for crystal
examination, to microbiology for Gram stain and culture, and to hematology for a
cell count. The fluid was negative for crystals. The hematology cell count of the
fluid was significant for 345 WBC. The fluid Gram stain was significant for the
presence of gram-negative plump cocci and moderate white blood cells. After 48 -
✔ ✔ kingella kingae - plump gr- bacilli/coccobacilli oxidase +, cat -, chocolate, b
hemoltic w pitting agar
eikenella - gr- bacillus, oxidase+, cat -, chocolate, NON beta hemolytic w/
pitting agar, has a beach odor
A 24-year-old man with HIV-positive status for 2 years presents due to an ongoing
chronic cough for the past 8 months. He admits to a mild fever that comes and
goes during that period. A 5 lb unintentional weight loss is also discovered since
his last visit to your office, which was approximately 9 months ago. He states he
has noted an increased amount of breathlessness with simple activities that were
never bothersome before the cough began. The patient denies smoking, and his
TB test is negative.
Question
What organism is most likely causing this patient's signs and symptoms?
1 Mycobacterium avium complex
2 Mycobacterium bovis
3 Mycobacterium chelonae
4 Mycobacterium haemophilum
,5 Mycobacterium leprae - ✔ ✔ MAC is almost like tb - but
in immunocompromised, less severe as tb
m leprae - leprosy, common in Asia, africa, central/south america. look
for bilateral ulnar nueropathy and skin lesions and anesthesia
the others cause lymphandenitis - scrofula, in northern europe
A 3-year-old boy is evaluated for a 24-hour history of diarrhea. His mother reports
that he had five episodes of foul-smelling watery diarrhea associated with
decreased appetite. A few other children at the same daycare center have
presented with the same problem. On physical examination, the child is well
hydrated and his abdomen is tender. Stool microscopy shows the presence of
motile trophozoites representing the etiological agent.
Question
What is most likely causing this patient's symptoms?
1 Cryptosporidiosis
2 Cyclosporiasis
3 Giardiasis
4 Isosporiasis
5 Microsporidiosis - ✔ ✔ giardia associated w/ daycare, easy bro
dx w/ microscopic detection of motile trophozoites, note foul smelling stools
crypto = dx w/ acid fast staining sporulated oocysts
, A 20-year-old college student suddenly collapsed. There was a rash. Another
student had been hospitalized with meningococcal meningitis characterized by
shock, adrenal hemorrhages, and extensive cutaneous and mucosal purpura. The
MOST likely diagnosis is which of the following?
1 subacute sclerosing panencephalitis
2 Creutzfeldt-Jakob disease
3 meningococcal meninigitis
4 multiple sclerosis
5 Waterhouse-Friderichsen syndrome - ✔ ✔ waterhouse -look at
adrenal hemorrhage
A 38-year-old man presents with nausea, vomiting, diarrhea, and abdominal
cramping for the past 2 hours. The patient reveals that he had consumed meat
that had been left uncovered for a night. Laboratory examination revealed that
the meat was contaminated with Gram-positive circular, clustered organisms.
Fairly large, yellow-colored colonies were formed when the organism was
grown on mannitol agar media at 40°C. The organism showed positive results
for coagulase enzyme activity and showed resistance to penicillin and methicillin
antibiotics.
Question
What organism was the causative agent of the food poisoning?
1 Clostridium perfringens
2 Enterococcus faecalis
3 Escherichia coli
4 Staphylococcus aureus
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