Synonyms for VHF (same or very similar meaning)
WordNet sense 1 (a group of illnesses caused by a viral infection (usually restricted to a specific geographic area); fever and gastrointestinal symptoms are followed by capillary hemorrhage):
hemorrhagic fever, haemorrhagic fever, viral haemorrhagic fever, viral hemorrhagic feverWordNet sense 2 (30 to 300 megahertz):
very high frequencyFrom the ODE community, based on WordNetadd/edit