**Question:** Meningococci differ from gonococci in that they-

A. produce fewer extracellular enzymes
B. are more resistant to antibiotics
C. are less likely to cause systemic infections
D. are more virulent and cause more severe illnesses

**Core Concept:**

Meningococci and gonococci are both gram-negative diplococci that belong to the Neisseriaceae family. However, they are distinct microorganisms causing different diseases. Meningococci primarily cause meningitis and sepsis, while gonococci are associated with sexually transmitted infections (STIs) like gonorrhea.

**Why the Correct Answer is Right:**

Correct Answer: D. are more virulent and cause more severe illnesses

Meningococci are more virulent than gonococci, meaning they possess a higher ability to cause disease and lead to severe outcomes. Meningococcal infections often result in life-threatening complications, such as meningitis, sepsis, and respiratory failure, especially in immunocompromised individuals. In contrast, gonococcal infections are less severe and typically affect the genitourinary tract, causing conditions like urethritis, cervicitis, and pelvic inflammatory disease (PID).

**Why Each Wrong Option is Incorrect:**

A. producing fewer extracellular enzymes: This characteristic is irrelevant as it does not explain the difference in virulence between meningococci and gonococci.
B. being more resistant to antibiotics: Although both bacteria can develop resistance to antibiotics, this option does not differentiate between the two species in terms of virulence.

**Clinical Pearl:**

Meningococcal infections are a global public health concern, especially in children and young adults. Early diagnosis and treatment are crucial for reducing morbidity and mortality. In addition, the World Health Organization (WHO) recommends vaccinations against the leading serogroups (A, B, C, W, Y) of N. meningitidis to prevent meningococcal diseases.