# Circoviridae Survey in Captive Non-Human Primates, Italy

## TL;DR

This study found circoviruses in non-human primates in Italy, showing genetic similarity to a virus found in a lizard, suggesting possible cross-species transmission.

## Contribution

The study reports the detection of CyV strains in non-human primates with high genetic similarity to a CyV strain from a lizard, expanding understanding of circovirus host range.

## Key findings

- CyV DNA was detected in 18.7% of 48 non-human primates in Italy.
- Five CyV strains showed 98.3–98.6% nucleotide identity to a CyV strain from a Maltese wall lizard.
- The virome of captive animals is influenced by dietary and environmental factors.

## Abstract

Information on the host range and genetic diversity of members of the Circoviridae family is quickly increasing, but the ecology of these viruses remains largely unknown. In this study, using a panviral PCR targeting the Rep gene, we detected CyV DNA in rectal and saliva swabs collected from 48 NHPs housed in Bioparco—Rome Zoological Garden (Italy) and in the Anima Natura Wild Sanctuary Semproniano (Grosseto, Italy), with an overall prevalence of 18.7% (9/48). When reconstructing the sequence and genome organization of five strains, all CyVs appeared genetically highly related (98.3–98.6% nucleotide identity) to a CyV strain (RI196/ITA) detected in the intestinal content of a Maltese wall lizard (Podarcis filfolensis) in Italy.

Circoviruses (CVs) and cycloviruses (CyVs), members of the family Circoviridae, have been identified only occasionally in non-human primates (NHPs). In this study, we investigated the presence and genetic features of these viruses in 48 NHPs housed in the Bioparco—Rome Zoological Garden (Italy) and in the Anima Natura Wild Sanctuary Semproniano (Grosseto, Italy), testing fecal, saliva, and serum samples with a broadly reactive consensus nested PCR able of amplifying a partial region of the replicase (Rep) gene of members of the family Circoviridae. Viral DNA was detected in a total of 10 samples, including a saliva swab and 9 fecal samples collected, respectively from five Japanese macaques (Macaca fuscata) and four mandrills (Mandrillus sphinx), with an overall prevalence of 18.7% (9/48). On genome sequencing, five strains revealed the highest nucleotide identity (98.3–98.6%) to a CyV strain (RI196/ITA) detected in the intestinal content of a Maltese wall lizard (Podarcis filfolensis) in Italy. Although the origin of the Italian NHP strains, genetically distant from previously detected NHP CyVs, is uncertain, our results also highlight that the virome of captive animals is modulated by the different dietary and environmental sources of exposure.