21.   In that time, an infected person may leave the seeds of misery on doorknobs, bus railings and fax machines.

22.   In this period, the infected person experiences no symptoms.

23.   It can take weeks for the body to make antibodies, so a newly infected person may test negative but still have the disease.

24.   It made no mention of coming into contact with routinely administered drugs that had been adulterated by an infected person.

25.   Its victims tend to be malnourished people with weakened immune systems who live in close quarters with an infected person.

26.   One that bites an infected person picks up the worm larvae, called microfilariae, and injects them into the next person it bites.

27.   Perhaps, the scientists say, health workers vastly increase the danger of spread when they treat an infected person without adequate infection-control practices.

28.   Rehydration with oral fluids or intravenous solutions is critical for cholera, to replace the gallons of water and chemicals that an infected person can lose in a day.

29.   Reporting the name of the infected person to the health department is not necessary for such partner notification services.

30.   Rubella, a viral illness, can be spread from person to person by droplets from the nose or throat of an infected person.