MLT 240: Comprehensive Final Exam
Questions With Complete Solutions Blood is drawn from a patient for serological tests for a viral disease at the time of onset and again 4 weeks later. The
results of the tests are considered diagnostic if the:
First antibody titer is 2x the second First and second antibody titers are equal First antibody is 4x the second Second antibody titer is at least 4x the first - Correct Answers ✅Second antibody titer is at least 4x the first Four blood cultures were taken over a 24-hour period from a 20 year old woman with severe diarrhea. The cultures grew motile (room temperature), gram-negative rods. A urine specimen obtained by catheterization also showed gram- negative rods, 100,000 cfu/mL. Given the following results, which is the most likely organism?TSI = A/A gas Indole = + MR = + VP = Neg Citrate = Neg H2S = Neg Urease = Neg Lysine decarboxylase = + Phenylalanine deaminase = Neg Proteus vulgaris Salmonella typhi Yersinia enterocolitica
- coli - Correct Answers ✅E. coli 1 / 4
MLT 240: Comprehensive Final Exam
Questions With Complete Solutions The enterotoxin produced by certain strains of hemolytic,
coagulase positive Staphylococcus aureus:
Is destroyed by boiling for 15-30 minutes Is identical to the dermonecrotic toxin Causes one type of bacterial food poisoning Is highly antigenic - Correct Answers ✅Causes one type of bacterial food poisoning The small, slowly growing gray white colonies seen on the blood agar plate were recovered from a blood culture of a 40 year-old farm worker who developed fever and chills leading to septicemia, following ingestion of contaminated milk. The gram stain of this organism is seen in the lower image revealing small gram-negative cocci in loose clusters. Key to the identification of this blood culture isolate is the rapid urease reaction. From these observation what would the presumptive identification of this isolate be?Cardiobacterium hominis Eikenella corrodens Brucella species Campylobacter upsaliensis - Correct Answers ✅Brucella species 2 / 4
MLT 240: Comprehensive Final Exam
Questions With Complete Solutions (answer) The small, slowly growing gray white colonies seen on the blood agar plate were recovered from a blood culture of a 40 year-old farm worker who developed fever and chills leading to septicemia, following ingestion of contaminated milk. The gram stain of this organism is seen in the lower image revealing small gram-negative cocci in loose clusters. Key to the identification of this blood culture isolate is the rapid urease reaction. From these observation what would the presumptive identification of this isolate be?Cardiobacterium hominis Eikenella corrodens Brucella species Campylobacter upsaliensis - Correct Answers ✅Brucella species Approximately 80-90% of the neutrophils on the peripheral blood smear of a young man are similar to those in the image. This peripheral smear most likely represents which condition?Infection with left shift Folic acid deficiency Pelger-Huet anomaly Leukemoid reaction - Correct Answers ✅ 3 / 4
MLT 240: Comprehensive Final Exam
Questions With Complete Solutions (answer) Approximately 80-90% of the neutrophils on the peripheral blood smear of a young man are similar to those in the image. This peripheral smear most likely represents which condition?Infection with left shift Folic acid deficiency Pelger-Huet anomaly Leukemoid reaction - Correct Answers ✅Pelger-Huet anomaly When myocardial infarction occurs, the first enzyme to
become elevated is:
CK LD AST ALT - Correct Answers ✅CK Which of the following is true regarding apheresis platelets?The minimum platelet count must be 3.0 X 10^11, pH must be >6.0 The minimum platelet count must be 30. X 10^10, pH must be <6.2
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