The phrase "an enveloped" is not correct in standard written English.
It is not typically used as "enveloped" is an adjective that does not require an article like "an" before it.
Example: "The letter was placed in an enveloped package."
Alternatives: "a wrapped" or "a covered".
It is an enveloped, negative single-strand RNA virus.
Chikungunya virus (CHIKV) is an enveloped, RNA positive-strand Alphavirus belonging to the Togaviridae family [2].
Since HCV is also an enveloped RNA virus, we hypothesized that the ESCRT system might be required for HCV production.
The virus was identified as an enveloped positive-stranded RNA virus with a size of approximately 55 nm in diameter.
HSV-1 is an enveloped, dsDNA virus that is capable of undergoing both lytic and latent infections within its host.
HIV is also an enveloped virus.
It is an enveloped and a non-cytopathic virus.
Rabies virus (family Rhabdoviridae, genus Lyssavirus) is an enveloped, negative, single-stranded RNA virus (21 ).
PRRS is caused by infection with an enveloped positive stranded RNA virus [ 12, 13].
Examination showed an enveloped virus of 100 120 nm diameter (www.vet.utk.edu/pubs/mkenned2/EID_08-1574).
DENV is an enveloped, single-stranded, positive-strand RNA virus, member of the genus Flavivirus in the Flaviviridae family.
