Antonyms are words that have opposite meanings. For the term "Group B Arboviruses," some possible antonyms include "non-arboviruses," "non-group B viruses," or "arboviruses not belonging to Group B." Arboviruses are viruses that are transmitted to humans through the bites of infected arthropods, such as mosquitoes, ticks, or sandflies. Group B Arboviruses include viruses such as Rift Valley fever, yellow fever, West Nile virus, and Japanese encephalitis virus. By contrast, non-arboviruses are viruses that do not require arthropods as vectors for transmission. The opposite of Group B Arboviruses, therefore, are viruses that either do not belong to this group or are not transmitted by arthropods.