I'm not sure how this is helpful Helen? I had bed bugs 12 years ago, so I am familiar with them, but as I said I'm not in the business. Its very common that bug bites occur in threes, as in the case with my sister inlaw.
I was asked to take my sister inlaw to a doctor that could identify this as a bedbug bite and without a much guidance, that in itself is a lot to ask for considering that we were on holiday. Additonally, the host (often replies in less than an hour) didn't reply for 24 hours despite repeated attempts to get in touch. when he finally did, he said "oh it was a sunday" which would have been a reasonable explanation if that was the policy in the listing. I spend over $10k a year on AirBnB, why shouldn't I be treated as a valued customer? Why should I accept a dismissive and condesending tone from a Customer Service rep? Lastly why are you jumping in on this thread now?