- One can still have an infection without having any fever.
- Bacteries can develop themselves in various environments; and antibiotics specific for each of them will most likely be best than a general one.
But... I'm pretty sure the doctors who's treating her knows that, so it's probably just a question of time until they do find what's wrong if it's really an infection
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Edit: Oh right, forgot to say: cultures of bacterias can take a while to develop, so it's a little a waiting game to start with
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In short: while it might take a while, it should just be a question of time
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