United States Department of Agriculture Agricultural Research Service (USDA) offers bee disease diagnosis service for beekeepers across the U.S.
Samples received of adult bees and beeswax comb (with and without bee brood) are examined for bacterial, fungal and microsporidian diseases as well as for two species of parasitic mites and other pests associated with honey bees (i.e., small hive beetle, Aethina tumida).
When requested, American foulbrood samples are cultured and isolates are screened for their sensitivity to Terramycin (oxytetracycline) and Tylan (tylosin).
There is no charge for this service.
They do not analyze samples (bees, wax comb, pollen, etc.) for the presence of viruses or pesticide residue.
For details and how to submit samples, see: USDA Bee Disease Diagnosis Service