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Identification of a new genotype of Torque Teno Mini virus

Seyed Mohammad Jazaeri Farsani12, Maarten F Jebbink1, Martin Deijs1, Marta Canuti1, Karel A van Dort3, Margreet Bakker1, Bart PX Grady4, Maria Prins4, Formijn J van Hemert1, Neeltje A Kootstra3 and Lia van der Hoek1*

Author Affiliations

1 Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands

2 Tehran University of Medical Sciences, Tehran, Iran

3 Laboratory of Viral Immune Pathogenesis, Department of Experimental Immunology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands

4 Public Health Service of Amsterdam, Cluster of Infectious Diseases, Department of Research, Amsterdam, The Netherlands

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Virology Journal 2013, 10:323  doi:10.1186/1743-422X-10-323

Published: 30 October 2013



Although human torque teno viruses (TTVs) were first discovered in 1997, still many associated aspects are not clarified yet. The viruses reveal a remarkable heterogeneity and it is possible that some genotypes are more pathogenic than others. The identification of all genotypes is essential to confirm previous pathogenicity data, and an unbiased search for novel viruses is needed to identify TTVs that might be related to disease.


The virus discovery technique VIDISCA-454 was used to screen serum of 55 HIV-1 positive injecting drug users, from the Amsterdam Cohort Studies, in search for novel blood-blood transmittable viruses which are undetectable via normal diagnostics or panvirus-primer PCRs.


A novel torque teno mini virus (TTMV) was identified in two patients and the sequence of the full genomes were determined. The virus is significantly different from the known TTMVs (< 40% amino acid identity in ORF1), yet it contains conserved characteristics that are also present in other TTMVs. The virus is chronically present in both patients, and these patients both suffered from a pneumococcal pneumonia during follow up and had extremely low B-cells counts.


We describe a novel TTMV which we tentatively named TTMV-13. Further research is needed to address the epidemiology and pathogenicity of this novel virus.

Torque teno mini virus; VIDISCA-454; Virus discovery