classification of viruses. enveloped viruses.

allergen arenaviridae bacteria bacterium biology bug bunyaviridae classification coronaviridae danger disease dna double ebola enveloped epidemiology filoviridae flat flaviviridae graphic health hospital icon ill illness illustration immune infection medical medicine microbe microbiology microscopic nonenveloped organism orthomyxoviridae paramyxoviridae protection retroviridae rhabdoviridae rna scheme science set sick spread standed table togaviridae vector virus viruses