21.   We have learned there is a window of time between when a person is infected and the point at which existing HIV antibody tests will detect that infection.

22.   When a person is infected by HIV, both arms of the immune system react, deploying many types of antibodies and immune cells.

23.   When it first infects a person, it may produce no discernible symptoms.

24.   A person can be infected by inhaling mist contaminated with bacteria in the shower.

25.   A person can be infected by inhaling shower mist contaminated by the bacteria.

26.   Aceh has one person infected with HIV.

27.   As with most viruses, once a person is infected with West Nile virus, they are immune to it for the rest of their lives.

28.   At least one person is infected with TB every second.

29.   Health experts are in agreement that once Ebola infects a person, hygiene conditions dictate the speed of its spread to others.

30.   Health experts are in agreement that once Ebola infects a person, hygiene conditions will dictate the speed of its spread to others.