Final answer:
Staphylococcus aureus should be suspected in a case of cellulitis after a puncture wound. This bacterium is gram-positive and forms grape-like clusters. Proper antibiotic treatment is important to prevent serious complications.
Step-by-step explanation:
In a case of cellulitis after a puncture wound, the organism that should be suspected is Staphylococcus aureus. This bacterium is a common cause of wound infections, and it is gram-positive, spherical, and forms grape-like clusters. Some strains of S. aureus are resistant to many antibiotics, making proper antibiotic treatment important to prevent serious complications.