The most common infecting organism in acute lymphangitis is:
a. Lymphangitis manifests as an erythematous linear streak that often extends to a draining lymph node basin; associated lymphadenopathy, fever, and leukocytosis with a shift to immature forms may be apparent.
b. Cellulitis is usually caused by a single aerobic pathogen. The organisms most frequently responsible for cellulitis in otherwise healthy adults are S. pyogenes and S. aureus. Of the two, S. pyogenes is the more common and is the usual pathogen in patients with associated lymphangitis.
c. S. aureus is usually present in patients with underlying chronic skin disease.
d. Haemophilus influenzae sometimes causes cellulitis in children or adults infected with HIV.
e. Streptococcus pneumoniae may cause this condition in patients with diabetes mellitus, alcoholism, nephrotic syndrome, systemic lupus erythematosus, or hematologic malignancies.
f. P. multocida may cause cellulitis as a complication of dog or cat bites.
g. S. epidermidis is a recognized cause of cellulitis among immunocompromised patients, including those with HIV infection and those receiving organ transplants.