31.   Many infections are clinically inapparent, and the characteristic nodules are only discovered incidentally at necropsy.

32.   Infection is almost invariably asymptomatic, and is discovered only at post mortem examination.

33.   The prepatent period from egg infection is about eight weeks.

34.   Where H. isolonche infection is endemic in pheasantries, the runs should be abandoned and pheasant chicks reared on fresh ground.

35.   A defect in the gene which produces a vital enzyme, ADA, means that any infection she contracts is likely to prove fatal.

36.   Also, individuals can reinfect themselves months after they think the infection is gone.

37.   Although doctors have learned in recent years that most peptic ulcers are caused by a bacterial infection of the stomach, the infection has been hard to detect.

38.   Among its complications are infection of the urinary tract and acute blockage of urine flow that requires emergency measures to restore it.

39.   Among them are infections, tearing the tendon again, stiffness from arthritis and potentially fatal blood clots that could form in the leg and travel to the lung.

40.   And bacterial infections are a constant threat at the warm, nutrient-filled border between gums and teeth.