The ICTV's recommendation for how to write species and virus names. (Updated May 28, 2019)
Esteemed virologists, ask them what is the correct form of Tomato brown rugose fruit virus: TBRFV or ToBRFVI appreciate your comments
The ICTV Study Group recommends using TBRFV as the abbreviation for Tomato brown rugose fruit virus (see https://talk.ictvonline.org/ictv-reports/ictv_online_report/positive-sense-rna-viruses/w/virgaviridae/672/genus-tobamovirus). But keep in mind that this is just a recommendation. The ICTV does not officially endorse virus name abbreviations.