Molecular epidemiology and genotyping of TT virus isolated from Saudi blood donors and hepatitis patients.

Abstract:

BACKGROUND:In Saudi Arabia, the epidemiology and clinical significance of Torque Teno virus (TTV) infection alone and in patients with hepatitis virus infections have not been determined in a single study. In this paper, we molecularly investigated the rate and genotypes of TTV infection among Saudi Arabian blood donors and patients with viral hepatitis. The effect of TTV coinfection on viral hepatitis was also examined. SUBJECTS AND METHODS:DNA was extracted from the sera of 200 healthy blood volunteers, 45 hepatitis B virus patients, 100 hepatitis C virus patients, 19 hepatitis G virus patients, and 56 non-A-G hepatitis patients. TTV DNA was amplified using primers derived from the ORF1 and 5'UTR regions. The alanine aminotransferase (ALT) level was determined for each specimen. Sequencing of ORF1 amplicons was carried out to investigate TTV genotypes. RESULTS:Using primers derived from ORF1 and 5'UTR, TTV DNA was detected in 5.5% and 50.5%, respectively, of healthy blood donors, in 2.2% and 88.8% in hepatitis B patients, in 2.0% and 70% of hepatitis C patients, in 15.8% and 100% of hepatitis G patients, in 5.4% and 12.5% of non-A-G hepatitis patients and in 4.8% and 56.4% overall. No detrimental effect of TTV coinfection in viral hepatitis patients was noted. An overall prevalence of 4.8% and 56.4% was established. Phylogenetic analysis indicated that the most common genotype of TTV among Saudis is 2c. CONCLUSION:The rate of TTV infection among Saudi Arabians seems to be lower than that stated in previous reports on Saudi Arabia and in some other countries. The virus does not seem to worsen the status of those who are suffering from viral hepatitis infection.

journal_name

Ann Saudi Med

journal_title

Annals of Saudi medicine

authors

Al-Mozaini MA,Al-Ahdal MN,Kessie G,Dela Cruz DM,Rezeig MA,Al-Shammary FJ

doi

10.5144/0256-4947.2006.444

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

444-9

issue

6

eissn

0256-4947

issn

0975-4466

pii

06-189

journal_volume

26

pub_type

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