USMLE Step 1 QUESTION of the DAY!

A husband and wife present with nausea, vomiting, and diarrhea 6 hours after sharing a Rice Burrito from their favorite Mexican restaurant. Which of the following organisms is most likely to be the cause?

A) Vibrio cholerae
B) Bacillus cereus
C) Enterotoxigenic E. coli
D) Salmonella typhi
E) Staphylococcus aureus

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Answer: B) Bacillus cereus. B. cereus is an aerobic, gram (+), spore-forming rod. It is found in grains. Its spores survive food preparation such as boiling. Treatment includes fluids and take care of symptoms.



USMLE Step 1 D.O.C. of the DAY!

Drug of choice for

Chlamydia trachomatis causing pelvic inflammatory disease

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Doxycycline


USMLE Step 1 Fact of the Day!

Tumor Markers:
Alpha-fetoprotein: Hepatocellular carcinoma, yolk sac tumor of ovary
Carcinoembryonic antigen: Colon adenocarcinoma, pancreatic carcinoma
Prostate-specific antigen: Prostate adenocarcinoma (present in small amounts in normal prostate)
Human chorionic gonadotropin: Choriocarcinoma
5’HIAA: carcinoid
CA 19-9: colon, pancreatic, and breast cancer
CA-125: Ovarian cancer
CD 25: hairy cell leukemia, adult T-cell leukemia
CD 30: Hodgkin’s disease
Neuron-specific enolase: small cell lung cancer, neuroblastoma
Acid phosphatase: prostate carcinoma
Alkaline phosphatase: Paget’s disease, biliary disease, metastases to bone