Yes, I agree with Daysleepers. Speak with your vet about this. They will likely prescribe a preventative that will kill fleas, ticks, and worms so you never have to worry about this again.
Since the pup came from such bad conditions, a thorough vet exam isn't a bad idea in the first place. You should also talk to your vet about starting vaccinations if you haven't already.
Since the pup came from such bad conditions, a thorough vet exam isn't a bad idea in the first place. You should also talk to your vet about starting vaccinations if you haven't already.