21.   If the incubation period is short, the epidemic should play itself out in the next few years.

22.   In addition, the incubation period is much longer.

23.   In cases of biological weapons, often there is an incubation period, as with the deadly bacterial agent anthrax.

24.   In those days, the incubation periods of most infections were longer than the ocean crossings aboard ships and thus illnesses could be detected en route.

25.   It is not clear when she was exposed to anthrax spores, but the normal incubation period for cutaneous anthrax is one to seven days.

26.   It is taken throughout the trip and four weeks after return, to cover the incubation period.

27.   Its extended incubation period on the WB mininetwork suggests a problem with direction and cast and script, all of which have gone through revisions.

28.   Nevertheless, after a long incubation period, she has conceived, written and co-directed her first Broadway show.

29.   No one knows the incubation period for humans.

30.   Nobody can know whether any tourists have caught the virus here, because it has an incubation period of two to seven weeks.