Q: Which of the following is a key sign of hepatitis and is caused by the accumulation of bilirubin in the tissues? Express the relevant equation for bilirubin metabolism.

Jaundice; $$\text{Hemoglobin} \rightarrow \text{Bilirubin} \rightarrow \text{Liver processing} \rightarrow \text{Excretion}$$

Q: Which of the following is a marker for helminth infection and is often elevated in blood tests? Express the relevant formula for calculating the percentage of this cell type.

Eosinophilia; $$\frac{\text{Eosinophils}}{\text{Total WBC}} \times 100\%$$

Question 1

Which pathogen is most commonly associated with healthcare-acquired pneumonia (HAP) and is often linked to aspiration or assisted ventilation?

Accepted Answer

Multiple bacteria, including Staphylococcus aureus and Pseudomonas aeruginosa, often cause HAP, especially in patients with aspiration or assisted ventilation.

Question 2

A patient presents with a sore throat. Which of the following is the most common etiology?

Accepted Answer

Viral infection

Question 3

Which of the following statements about Mycobacterium tuberculosis is TRUE?

Accepted Answer

It has a waxy cell wall, is slow-growing, and is resistant to drying and disinfectants.

Question 4

A child develops a paroxysmal cough and is diagnosed with whooping cough. Which of the following statements is CORRECT regarding prevention and treatment?

Accepted Answer

The DTaP vaccine prevents pertussis, but immunity is not lifelong.

Question 5

Which of the following is a key sign of hepatitis and is caused by the accumulation of bilirubin in the tissues? Express the relevant equation for bilirubin metabolism.

Accepted Answer

Jaundice; $$	ext{Hemoglobin} ightarrow 	ext{Bilirubin} ightarrow 	ext{Liver processing} ightarrow 	ext{Excretion}$$

Question 6

A patient with AIDS develops a dangerous fungal pneumonia. Which organism is most likely responsible?

Accepted Answer

Pneumocystis jirovecii (PCP)

Question 7

Which of the following is the most common cause of bacterial diarrhea in the United States?

Accepted Answer

Campylobacter

Question 8

A patient presents with pseudomembranous colitis after antibiotic therapy. Which organism is most likely responsible, and what is the mechanism?

Accepted Answer

Clostridioides difficile; disruption of normal flora allows overgrowth

Question 9

Which hepatitis virus is NOT genetically related to the others and does NOT become chronic?

Accepted Answer

Hepatitis A

Question 10

A patient with chronic diarrhea after travel is most likely infected with which organism?

Accepted Answer

Giardia duodenalis

Question 11

Which of the following is a marker for helminth infection and is often elevated in blood tests? Express the relevant formula for calculating the percentage of this cell type.

Accepted Answer

Eosinophilia; $$\frac{	ext{Eosinophils}}{	ext{Total WBC}} 	imes 100\%$$

Question 12

Which organism is associated with gastric ulcers and what is the primary mechanism of pathogenesis?

Accepted Answer

Helicobacter pylori; produces urease to neutralize stomach acid and damages mucosa

Question 13

A patient presents with painful urination and is diagnosed with gonorrhea. Which of the following complications is NOT associated with gonorrhea?

Accepted Answer

Chancre formation

Question 14

Which organism is the most common cause of vaginitis and what is a key diagnostic feature?

Accepted Answer

Candida albicans; presence of budding yeast cells

Question 15

Which sexually transmitted infection is the most commonly reported in the United States and can cause PID?

Accepted Answer

Chlamydia

Question 16

A patient develops a painless chancre, followed by fever, hair loss, and rash. Which infection is this, and what is the correct sequence of stages?

Accepted Answer

Syphilis; primary (chancre), secondary (fever, hair loss, rash), tertiary (neurological/cardiovascular)

Question 17

Which organism is dominant in the normal vaginal flora during childbearing years and what is its role?

Accepted Answer

Lactobacillus; produces lactic acid to protect against infection

Question 18

Why is the term 'STI' preferred over 'STD' in medical communication?

Accepted Answer

'STI' is preferred because many infected individuals show no symptoms, and 'infection' is more accurate than 'disease'.

Question 19

A patient with hepatitis B is exposed to dried blood. Which statement is correct regarding the risk of infection?

Accepted Answer

Hepatitis B virus can survive several hours in dried blood, increasing the risk of transmission.

Infectious Diseases of the Respiratory, Gastrointestinal, and Genitourinary Systems

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