Smallpox was passed on from one victim to another by touch alone.
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Q2: Stored in the laboratories at the Centers
Q3: Major epidemics are caused by bacteria, viruses,
Q4: Human bodies are inhabited, both inside and
Q5: By 1958, routine immunization had eliminated smallpox
Q6: Unlike smallpox, there are many "invisible" cases
Q8: The concept and practice of immunization began
Q9: It is often in low-income, urban communities
Q10: _ are the most dangerous rabies threat
Q11: Rabies primarily attacks the _ system.
Q12: The rate of rabies infections in the
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