tofla virus tofla virus the tofla virus is a strain of hazara orthonairovirus in the genus orthonairovirus belonging to the crimean-congo hemorrhagic fever serogroup. it was isolated from ixodid in japan in 2016. tofla virus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: negarnaviricota class: ellioviricetes order: bunyavirales family: nairoviridae genus: orthonairovirus species: hazara orthonairovirus strain: tofla virus