Notes on Genus: Cryspovirus


Type member: Cryptosporidium parvum virus 1


General Description

This genus in the family Partitiviridae consists of a single species of virus that infects protozoa. The coat protein is substantially smaller than those of viruses in other genera of the family. It is named after the type (and only) species Cryptosporidium parvum virus 1.


Virions isometric (icosahedral), not enveloped, about 30 nm in diameter.


Linear, double stranded RNA of two segments, approximately 1.8 and 1.4 kb.

Genus Genomic Organization

The segments are monocistronic: RNA1 encodes RNA polymerase and RNA2 the coat protein.

Type Member Genomic Organization

  • RNA1 (1786 nt): encodes an RNA polymerase of 62 kDa
  • RNA2 (1374 nt): encodes the coat protein of 37 kDa