CBIC Updated CIC Exam Questions and Answers by faye

Among the listed pathogens, Hepatitis C has the highest risk of seroconversion following a percutaneous exposure, though it's important to note that Hepatitis B actually has the highest overall risk. However, since Hepatitis B is not listed among the options, the correct choice from the available ones is Hepatitis C.

The APIC Text confirms:

“The average risk of seroconversion after a percutaneous injury involving blood infected with hepatitis C virus is approximately 1.8 percent”.

The other options are not bloodborne pathogens typically associated with high seroconversion risks after needlestick or percutaneous exposure:

A. Shigella – transmitted fecal-orally, not percutaneously.

B. Syphilis – transmitted sexually or via mucous membranes.

C. Hepatitis A – primarily fecal-oral transmission, low occupational seroconversion risk.

An infection classified as healthcare-associated (HAI) means it is attributable to receiving care in a healthcare setting—in other words, it was acquired as a result of healthcare exposure rather than being present or incubating before care began. This concept applies across care settings, including long-term care facilities (LTCFs). The CDC describes HAIs as infections patients get while or soon after receiving health care, emphasizing acquisition linked to healthcare delivery rather than simply where the infection is detected. The Association for Professionals in Infection Control and Epidemiology (APIC) similarly explains that HAIs are infections patients can get in a healthcare facility while receiving medical care, which aligns with the idea of being acquired in that setting.

Option B (“identified in the facility”) is incorrect because an infection can be identified in an LTCF even if it was acquired elsewhere (e.g., incubating on admission or acquired during a recent hospitalization). Options A and D use fixed time thresholds; while some surveillance definitions use timing rules (often 48 hours in acute care) to help classify onset, “healthcare-associated” fundamentally implies acquisition related to healthcare exposure, best captured by acquired in the facility in this question

The Gram stain showing Gram-negative diplococci in cerebrospinal fluid (CSF) is characteristic of Neisseria meningitidis, a leading cause of bacterial meningitis in adolescents and young adults.

Step-by-Step Justification:

Gram Stain Interpretation:

Gram-negative diplococci in CSF strongly suggest Neisseria meningitidis​.

Classic Symptoms of Meningitis:

Fever, stiff neck, and vomiting are hallmark signs of meningococcal meningitis.

Neisseria meningitidis vs. Other Bacteria:

Haemophilus influenzae (Option A) → Gram-negative coccobacilli.

Listeria monocytogenes (Option C) → Gram-positive rods.

Streptococcus pneumoniae (Option D) → Gram-positive diplococci.

CBIC Infection Control References:

APIC Ready Reference for Microbes, "Neisseria meningitidis and Meningitis"​.

The Chi-square test is the most appropriate test for comparing infection rates (categorical data) before and after an intervention​.

CBIC Infection Control References:

CIC Study Guide, "Statistical Analysis in Infection Control," Chapter 5​.