alexa Simian TT virus (s-TTV) infection in patients with liver diseases.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Iwaki Y, Aiba N, Tran HT, Ding X, Hayashi S,

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Abstract Recently, we identified TTV isolates from nonhuman primates and named them simian TTV (s-TTV). To investigate the prevalence of s-TTV in humans, we examined sera from healthy individuals and patients with liver diseases in Japan for the presence of s-TTV DNA by PCR assay. s-TTV DNA was determined by nested PCR using s-TTV-specific primers designed from untranslated region of s-TTV genome. s-TTV DNA sequence was detected in three of 200 (1.5\%) healthy adults but none of 48 infants without liver disease. On the other hand, s-TTV DNA was detected in 30 of 287 (10.5\%) Japanese patients with liver disease. s-TTV coinfection with hepatitis B virus and hepatitis C virus were present in 16.7 and 30\% of these patients, respectively, while 53.3\% of patients were positive for s-TTV alone. Nucleotide sequence analyses in 20 patients confirmed that these PCR products were derived from s-TTV genome sequences and nearly 85\% identical to those of s-TTV prototypes from chimpanzees. Phylogenetic analysis demonstrated that all s-TTV isolates from humans were distinguished clearly from the human TTV isolates. Furthermore, s-TTV in humans was classified into two different genotypes as well as simians. Our results indicate that generally 10.5\% of Japanese patients with liver diseases were infected with s-TTV. The routes of s-TTV transmission from animal to human require clarification.
This article was published in Hepatol Res and referenced in Journal of Vaccines & Vaccination

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