101 as the children are protected from infection by temporary segregation of earners, there is very
little risk of diphtheria breaking out again.
316- We can understand from the passage that the protection supplied by serum injection ------- . A) should only be thought of in exceptional conditions
B) is immediately effective but short-termed
C) is unreliable and can have an adverse effect on the patient
D) has generally proved unsuccessful except for during diphtheria epidemics
E) lasts long and is entirely safe
