51.   But the parasites have an incubation period of a week or more, so it may take several more days for any serious health problems to develop.

52.   But the parasites have an incubation period of about a week, so any serious health problems were expected to develop next week.

53.   City health officials are also contacting patients who visited the hospital over the past two weeks, the incubation period for anthrax.

54.   E. coli typically has an incubation period of three to eight days, but can take longer.

55.   Foot-and-mouth has a maximum incubation period of five days.

56.   Given the risk of the virus spreading during the incubation period, daily surveillance for telltale symptoms is a vital part of efforts to contain the disease.

57.   He said the disease has a five-year incubation period, and animals could easily be infected without showing symptoms.

58.   Heymann said that risk was now deemed over because the incubation period was at an end, without any additional reports of cases.

59.   However, Dr Lee said with the incubation period of the HIV virus it was difficult to tell by whom a patient was infected.

60.   How many people eventually die from the disease will depend on the incubation period, scientists predict.