title: Naesvirus
text: # Naesvirus
  
  Naesvirus is a genus of viruses in the family Myoviridae, not assigned to a subfamily. Bacteria serve as the natural host, with transmission achieved through passive diffusion. There are five species in this genus.
  
  ## Taxonomy
  
  Species:
  
     * Burkholderia virus Bcep1
  
     * Burkholderia virus Bcep43
  
     * Burkholderia virus Bcep781
  
     * Burkholderia virus BcepNY3
  
     * Xanthomonas virus OP2
  
  ## Structure
  
  Naesviruses are nonenveloped, with a head and tail.
  
  ## Genome
  
  All five species have been fully sequenced and are available from ICTV. They range between 46k and 49k nucleotides, with 62 to 71 proteins. The complete genomes are available from here.
  
  ## Life cycle
  
  The virus attaches to the host cell using its terminal fibers, and ejects the viral DNA into the host cytoplasm via contraction of its tail sheath. Once the viral genes have been replicated, the procapsid is assembled and packed. The tail is then assembled and the mature virions are released via lysis.
  
  ## History
  
  According to the ICTV's 2010–11 report, the genus Naesvirus was first accepted as a new genus, at the same time as all five of its contained species. This proposal is available here.
  
  