High prevalence of TT virus (TTV) infection in patients on maintenance hemodialysis: Frequent mixed infections with different genotypes and lack of evidence of associated liver disease
X. Forns et al., High prevalence of TT virus (TTV) infection in patients on maintenance hemodialysis: Frequent mixed infections with different genotypes and lack of evidence of associated liver disease, J MED VIROL, 59(3), 1999, pp. 313-317
Recently, a novel DNA virus, TT virus (TTV), was identified in patients wit
h post-transfusion non-A-G hepatitis. We analyzed the prevalence and clinic
al implications of TTV infection in a cohort of 96 Spanish patients on long
-term hemodialysis. TTV DNA was detected by nested PCR in 51 (53%) of 96 pa
tients, a prevalence significantly higher than that found in healthy blood
donors. Persistent liver test abnormalities were found in only 2 (7.7%) of
26 patients infected with TTV alone, compared with 12 (75%) of 16 patients
infected with hepatitis C or hepatitis B virus, or both (P < 0.01). Mixed i
nfections with multiple strains of TTV, including different major genotypes
, were common in patients on hemodialysis. These patients had received a si
gnificantly greater number of blood units (22.7 +/- 20) compared with patie
nts apparently infected with a single strain of TTV (8.9 +/- 11) (P = 0.01)
. Phylogenetic analyses of TTV from infected patients identified strains of
genotypes 1, 2, 3, and 4. In summary, TTV infection was common in patients
on hemodialysis but was not associated with liver disease. (C) 1999 Wiley-
Liss, Inc.