Viral plagues such as smallpox, polio, measles, hepatitis B, rabies, and other once-terrifying scourges have only been beaten back by vaccines.
These viral diseases have no known cure at all.
mnli hypothesis: These viral diseases have no known cure at all. premise: Viral plagues such as smallpox, polio, measles, hepatitis B, rabies, and other once-terrifying scourges have only been beaten back by vaccines.