Forum:River's Injection

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If this thread's title doesn't specify it's spoilery, don't bring any up.

In the episode " Crash Of The Byzantium" - River gives Amy an injection of some sort, with the excuse that it is to protect her from any possible germs/virus on the alien planet. But why, in all the episodes and planets I've seen, very very rarely is anyone worried about ambient virus infections. Is this just a way of bringing the characters together to talk, or is it a definate way of taking something from or adding something to Amy's dna/blood?