We don't have pets, but found a handful of fleas in our house. Is vacuuming every other day necessary?

We don’t have pets, but found a handful of fleas in our house over a period of a week or two. We have used carpet powder on the two area rugs (otherwise we don’t have carpet). We have been checking our feet every time we come in from outside, so have hopefully not brought any more in. Is it necessary to continue to vacuum the house every other day? Or is that only if we had more fleas (infestation)? Also, do you have any suggestions on keeping cats out of our yard, since this is the only thing we can think of that’s bringing fleas.

Thank you!