Morphologically, Brucella species are best described as:

Introduction:
Accurate morphological description aids in presumptive identification of bacteria in the laboratory.

Given Data / Assumptions:

• Brucella morphology is being queried.
• Microscopy typically guides early classification.

Concept / Approach:
Brucella are small, gram-negative coccobacilli, appearing as very short rods sometimes resembling cocci, especially in clinical smears.

Step-by-Step Solution:
Recall typical gram stain appearance. Differentiate from true cocci and long rods. Select coccobacilli as the most accurate descriptor.

Verification / Alternative check:
Textbook descriptions consistently list Brucella as coccobacilli.

Why Other Options Are Wrong:

• Cocci / Rods: Too generic and not precise for Brucella.
• Very short rods: Descriptive but not the proper morphological term.
• Spiral-shaped bacilli: Not applicable to Brucella.

Common Pitfalls:
Equating “very short rods” with the formal term; coccobacilli is the correct classification.

Final Answer:
Brucella are coccobacilli.