HBsAg subtype distribution among different populations of HBsAg carriers in Spain

1995 ◽  
Vol 11 (1) ◽  
pp. 39-45 ◽  
Author(s):  
J. E. Echevarría ◽  
P. León ◽  
J. A. López ◽  
A. Tenorio ◽  
C. J. Domingo ◽  
...  
Keyword(s):  
Hbsag Carriers ◽  
Hbsag Subtype ◽  
Different Populations ◽  
Subtype Distribution

scholarly journals Antigenic Diversity of Hepatitis B Virus Strains of Genotype F in Amerindians and Other Population Groups from Venezuela

1998 ◽  
Vol 36 (3) ◽  
pp. 648-651 ◽  
Author(s):  
Linda Blitz ◽  
Flor H. Pujol ◽  
Paul D. Swenson ◽  
Leticia Porto ◽  
Ricardo Atencio ◽  
...  
Keyword(s):  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Hepatitis B Surface Antigen ◽  
Serum Samples ◽  
Hbv Genotype ◽  
Hbsag Carriers ◽  
Hbsag Subtype ◽  
B Virus ◽  
Virus Strains ◽  
Genotype F

The adw4 subtype of hepatitis B virus (HBV) belongs to a unique genomic group (genotype F) representing the original HBV strains from the New World. Data regarding the prevalence of this subtype among HBV carriers in South America are, however, scarce, and those concerning HBV genotype F are based on only a few samples from Latin America. In this study, serum samples were obtained from 141 hepatitis B surface antigen (HBsAg) carriers from Amerindians and urban populations from Venezuela. The HBsAg subtype was identified with monoclonal antibodies in 105 samples, and the HBV genotype was identified by reverse-phase hybridization with DNA fragments in 58 samples. The adw4 subtype was highly prevalent in the population studied (75%); among the Amerindians, the prevalence was 97%. The adw2 subtype was also present (10%), while other subtypes (ayw3 and ayw4) were only occasionally found. The HBV subtype was associated with the expected genotype in most cases (80%), and thus genotype F was highly prevalent. Sequencing of viral strains that gave genotypes unpredicted by the HBsAg subtyping confirmed seven of them as belonging to not previously described genotype-subtype associations: namely, adw2 and ayw4 within genotype F.

Two Forms of MRSA Attack Different Populations

2008 ◽  
Vol 39 (11) ◽  
pp. 39
Author(s):  
BETSY BATES
Keyword(s):  
Different Populations

Association analisis of MTHFR and HTR1A genes with suicidal behavior in two different populations of Bashkortostan (Russia)

2008 ◽  
Author(s):  
Z. Khalilova ◽  
D. Gaysina ◽  
A. Kazantseva ◽  
E. Khusnutdinova
Keyword(s):  
Suicidal Behavior ◽  
Different Populations

Chemical composition and antibacterial activity of essential oils from different populations of Artemisia incana (Asteraceae) from Iran

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
M Atri ◽  
A Chehregani ◽  
S Yousefi ◽  
F Jalal
Keyword(s):  
Antibacterial Activity ◽  
Chemical Composition ◽  
Essential Oils ◽  
Different Populations

Gene Polymorphisms and Their Association to Coronavirus Family Infections: Susceptibility in Different Populations

2020 ◽  
Vol 5 ◽  
Keyword(s):  
Genetic Variants ◽  
Viral Infections ◽  
Human Leukocyte ◽  
Asian Population ◽  
African Region ◽  
Mediterranean Populations ◽  
Susceptibility To Infection ◽  
Asian Populations ◽  
Spread Pattern ◽  
Different Populations

Human leukocyte antigen (HLA) loci are highly polymorphic and determine differential features of the immune response in subjects from different regions. HLA genes have been proposed to determine genetic susceptibility to several diseases, particularly to viral infections. Moreover, it has been suggested that each ethnic group could have a different specificity of T-lymphocyte reactivity to the same viral infections. In this review, we analyzed the distribution of HLA types in countries of the Asian, European and North African region. Also, we studied the relation between these HLA polymorphisms and susceptibility to infection by the coronavirus. Our findings indicated that homozygosity would increase susceptibility to viral infections and, in some cases, to coronavirus infection. HLA types showing higher susceptibility were reported in Asian population, including China, Singapore, and Taiwan. In contrast, lower susceptibility HLA variants were detected among African populations, some Asian populations, and Mediterranean populations. The presented evidence along with the spread pattern of COVID-19 infection suggests that HLA genetic variants might be related to its infection susceptibility and severity. The investigation of HLA genetic variants distribution would be a useful tool to predict different populations’ susceptibility to viral infections.

Some comparative aspects of a longitudinal growth study in normal spanish children and other longitudinal studies

1986 ◽  
Vol 113 (4_Suppl) ◽  
pp. S93-S97 ◽  
Author(s):  
A. FERRANDEZ ◽  
E. MAYAYO ◽  
M. RODRIGUEZ ◽  
J.M. ARNAL ◽  
J. CARO ◽  
...  
Keyword(s):  
Longitudinal Studies ◽  
Environmental Conditions ◽  
Regional Differences ◽  
Longitudinal Growth ◽  
Growth Study ◽  
Growth Studies ◽  
Different Populations ◽  
Catch Up

Abstract The differences existing among some european longitudinal growth studies make it necessary to be cautious in the use of standards constructed on different populations. The improvement of the environmental conditions during the last 20 years is probably the most important cause of the "catch-up" phenomenon of the spanish stature. It is probable that racial characteristics also play a role, even in the same country as can be appreciated on comparing two spanish longitudinal studies based on children originary from different regions. All of wich indicates the need to use own standards in those countries wich, like ours, have lived through a period of intenses changes. Even exploratory studies of regional differences in the same country seem necesary.

Identification of sibling species in the genus Eucyclops from water-bodies of Ukraine and Russia using crossbreeding studies

2014 ◽  
Vol 25 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
V. I. Monchenko ◽  
L. P. Gaponova ◽  
V. R. Alekseev
Keyword(s):  
Cryptic Species ◽  
River Basin ◽  
Black Sea ◽  
Species Complex ◽  
River Basins ◽  
Water Bodies ◽  
Similar Species ◽  
Basin Water ◽  
Different Populations ◽  
Baltic Sea Basin

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

Estimation of risk for hepatocellular carcinoma among HBsAg carriers and heavy drinkers in Japan.

Kanzo ◽  
1986 ◽  
Vol 27 (9) ◽  
pp. 1281-1289 ◽  
Author(s):  
Hideaki TSUKUMA ◽  
Isaburo FUJIMOTO ◽  
Akira OSHIMA ◽  
The Liver Cancer Study Group of Jap
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hbsag Carriers ◽  
Heavy Drinkers ◽  
Estimation Of Risk
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