Assertion: yellow jack | /r/CreatedBy | a type of virus
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Source sentences:
text: Yellow fever , which is also known as sylvatic fever and viral hemorrhagic fever or VHF, is a severe infectious disease caused by a type of virus called a flavivirus.
text: Yellow fever , which is also known as sylvatic fever and viral hemorrhagic fever or VHF, is a severe infectious disease caused by a type of virus called a flavivirus.