51.   King Hassan II of Morocco was improving Thursday after he was hospitalized with an acute respiratory infection, a hospital statement said.

52.   Polio is an acute viral infection that mainly strikes children.

a. + infection >>共 424
viral 12.19%
respiratory 9.08%
bacterial 8.52%
new 4.75%
serious 2.81%
staph 2.60%
intestinal 2.25%
fungal 2.22%
severe 2.01%
upper 1.87%
acute 1.80%
acute + n. >>共 352
shortage 8.60%
leukemia 3.49%
infection 3.24%
food 3.24%
pain 3.12%
problem 2.99%
failure 2.49%
sense 2.49%
disease 1.93%
pancreatitis 1.93%
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