Tony: Yup, I know. Same with the more common problem of roaches.
Update on my situation. Pest control company has treated apt. and tenant’s belongings twice, two weeks apart. No further infestation or biting observed. Will treat one more time in couple of weeks as insurance, when pest control company promises a written guarantee, but with a $45/month continuing monthly service. I’ll opt for that, at least for a few months, just to keep the tenant happy. The first 3 treatments are $95 per treatment, which were pretty thorough.
All in all, I am getting off cheaper than I had feared, and tenant is likely to stay.
