21.   A single dose of worms eased symptoms for about a month.

22.   Half got a single dose of doxycycline, taken in the form of two capsules, and the others got two dummy capsules for comparison.

23.   However, they relied on a single dose of secretin with four weeks of observation.

24.   In addition, long-term methadone users already visit only once a week for a single dose, taking home another six.

25.   In the flu study, researchers found that a single dose of nose spray vaccine provided effective protection against two major flu strains and some protection against a third.

26.   In the animal tests, a single dose of the drug was effective against pox virus for seven days.

27.   It also showed evidence of controlling pain longer following a single dose -- for up to eight hours.

28.   It called for giving a single dose of the drug, nevirapine, to women during labor and another dose to the newborn within three days of birth.

29.   Levaquin requires a single daily dose while patients need two Cipro doses per day.

30.   One reason is the influence of studies that have found that a single dose of nevirapine can prevent transmission of HIV from mother to child.