11.   A smallpox epidemic would be much worse than an anthrax outbreak because it is more contagious and deadly.

12.   No cases have been detected, but a smallpox epidemic would be much worse than an anthrax outbreak, because the disease is contagious and more deadly than anthrax.

13.   Then she organized a group of young woman to do charitable works, including helping in clinics during a smallpox epidemic.