11.   Counselors from the Health Department are required to notify sex partners who might be exposed if the infected person will not.

12.   Doctors are learning to tailor therapy for each infected person by using new tests that detect the genetic patterns of HIV resistance to various drugs.

13.   Doctors must report to public health officials, on a confidential basis, the names of any infected person plus those who might have been exposed.

14.   Ebola normally is spread by direct contact with the blood or body fluids of an infected person.

15.   Having sex with an infected person or sharing drug needles spreads the disease.

16.   Humans can also contract it from close contact with an infected person or infected body fluids.

17.   In calling on them, health workers held to standard practice of never naming the infected person.

18.   In its saliva, the small fly injects a protozoan that it picks up from feasting on another infected person.

19.   In nearly all reported cases, several other people were swimming with the infected person and did not fall ill.

20.   In the four remaining cases, there was no conclusive evidence that the infected person passed the bacteria to anyone else.