A 12-yrs-old boy comes to you with pain and inflammation over the heel of his left foot and red streaks extending up the inner aspect of his leg. He remembers removing a wood splinter from the sole of his foot on the previous day. The most likely infecting organism is
The significant observation in this question is the description of lymphangitic inflammatory streaking up the inner aspect of the patient's leg. This is highly suggestive of a streptococcal infection.
Clostridium perfringens
Clostridium tetani
Staphylococcus
Streptococcus