11.   Humans are infected through mosquitoes that have fed from the blood of infected birds.

12.   Humans can become infected by handling animal products or inhaling anthrax spores from contaminated animal products.

13.   If placed into an envelope today, how long will the spores be able to infect a human?

14.   In the past, anthrax was viewed primarly as a livestock disease that on rare occasions infected humans.

15.   It has been seen only in poultry before, and the strain infecting humans is the same one that has killed thousands of chickens in Hong Kong.

16.   It rarely infects humans, though it is said to have been responsible for outbreaks of gangrene among soldiers in the First and Second World Wars.

17.   No humans have been infected with the virus, a strain endemic to the Philippines called Ebola Reston that has never been harmful to humans.

18.   No humans became infected in Alice or anywhere else in the United States, she said, and the virus never escaped the confines of the Alice quarantine facility.

19.   On the other hand, according to CDC, it may be so foreign that it lacks the ability to infect humans efficiently.

20.   Plague is a zoonotic disease, one that affects animals primarily and that infects humans by accident.