A microbiologist in our facility received 2 doses of Trumenba (MenB-FHbp) 6 months apart. Does he need to receive a third dose?

No. The 3-dose series (at 0, 1–2 and 6 months) is intended to rapidly induce immunity to serogroup B meningococcal bacteria. If a microbiologist or other person at increased risk has received 2 doses of Trumenba separated by 6 months their vaccine series can be considered to be complete.