Final answer:
SVC syndrome in children is usually linked to lymphoma, a type of cancer. Adenoviruses often lead to viral conjunctivitis, and coccidioidomycosis is also called Valley fever. Systemic viral infections like HIV can predispose patients to secondary infections.
Step-by-step explanation:
SVC (Superior Vena Cava) syndrome in previously healthy children is most often associated with lymphoma, which is a type of cancer rather than an infection. Although not one of the choices given in the question, this condition is important to recognize because it can be a medical emergency. Among infectious causes, bacterial infections such as those caused by Haemophilus influenzae type b or Streptococcus pneumoniae can lead to serious complications but are not typically associated with SVC syndrome in children.
Turning to the information provided on various infections, Adenoviruses can cause viral conjunctivitis (option a). Coccidioidomycosis is also known as Valley fever (option B). Examining systemic viral infections, the varicella-zoster virus can lead to chickenpox, a systemic infection, and a primary HIV infection can make patients more susceptible to secondary infections.