I need information about a what a sentence means

[MelanieB]

Hello. Im a new user and im not sure i am using this properly, but i'll try this anyways. :)
I am writing a report about the epidemic of Polio. I have read a few articles and there are some sentences i do not understand. Please help me understand. I will write you a paragraph and the sentence i do not understand.

-- President Franklin Roosevelt delcared a War on Polio during his administration, and the tremendous resourses of postwar America were brought to bear on the problem of developing a vaccine. From the beginning of this efffort, it was clear that such a vaccine was atleast theoretically feasible, as contrasted with such pathogens as malaria and HIV, where no such assurance exist. In the early 1960s,the work bore fruit, first with the destroyed virus...

The words underlined and highlighted blue--The work bore fruit??

Thanx -MelanieB

[aggelos]

Produced good results. It's a metaphor from trees that bear (=produce) fruit.

[MelanieB]

Sweet thanx a lot!