Flaviviruses share several common aspects : common size ( 40-65 nm ) , symmetry ( enveloped , icosahedral nucleocapsid ) , nucleic acid ( positive-sense , single-stranded RNA of approximately 10,000-11 ,000 bases ) , and appearance in the electron microscope .
( 2 ) Flaviviruses share a common size ( 40-65 nm ) , symmetry ( enveloped , icosahedral nucleocapsid ) , nucleic acid ( positive-sense , single stranded RNA approximately 10,000-11 ,000 bases ) , and appearance in the electron microscope .