is this a sentence fragment? in the early 1800s, yellow fever, a viral disease spread by mosquitoes, not by…

is this a sentence fragment? in the early 1800s, yellow fever, a viral disease spread by mosquitoes, not by unsanitary conditions as was believed at the time. yes no
Answer
Brief Explanations:
A sentence fragment lacks a subject, verb, or complete thought. The given text has a subject ("yellow fever") and a verb ("spread"), and expresses a complete thought about yellow - fever's mode of spread in the 1800s.
Answer:
no