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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of epidemiology 10 (1994), S. 279-283 
    ISSN: 1573-7284
    Keywords: Drug addicts ; HBV ; HCV ; HDV ; HIV
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Hepatitis viruses and the acquired immunodeficiency viruses often infect intravenous drug addicts (IVDAs). Our study includes 255 IVDAs (26 females and 229 males, aged 20–35 years) from Cagliari. Of 255 subjects examined, 207 (81.1%) were positive for anti-HCV and 84 (32.9%) for anti-HIV. Nineteen (7.4%) subjects were HBsAg carriers, and 12 of these (63%) had an HDV super-infection. Markers of previous HBV infections were tested in 223 cases and 137 (61.4%) were found positive; of these 14 (10.2%) also had HDV infection. Of the 223 drug addicts examined for all infection markers, 18 (8%) were negative to all markers, 46 (20.6%) were positive to only one, 89(39.9%) were positive to two, 64 (28.7%) to three and 6 (2.6%) were positive to all. Subjects with a single infection were significantly fewer than those with multiple infections. The correlations studied among the various markers did not point out any statistically significant associations. Even so, a previous HBV infection was more common while active HBV/HDV infections were less common among subjects with anti-HCV; HDV infection was more common among HIV-positive subjects. In HBsAg carriers neither HBV-DNA nor HCV-RNA was detected; HCV-RNA was found more frequently in anti-HIV positive subjects than in subjects with the anti-HCV isolate.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7284
    Keywords: Streptococcus mutans ; Dental caries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study population (105 schoolchildren aged 5.5 – 11.5 yrs), dental decay was detected in 75.2% and S. mutans in 55.2% of the subjects. The presence of S. mutans was assessed - using the selective GSTB medium - in unstimulated saliva and in pooled occlusal and pooled buccal plaques from the four most posterior teeth. All three samples showed association between S. mutans presence and caries prevalence. Of the two types of plaque, the occlusal not only had a higher frequency of isolation but also a significantly higher proportion of S. mutans. The presence of S. mutans was significantly associated with both caries prevalence and extent of caries experience. Both S. mutans prevalence and S. mutans proportion in plaque increased with the number of decayed teeth present among those sampled. Sucrose consumption between meals appeared to be more correlated with the degree of caries experience rather than with caries or S. mutans prevalence. A second clinical examination was scheduled six months after the first for S. mutans-positive children who either were free of active carious lesions, or were caries-active but without signs of dental decay in the sampled teeth. Caries-active subjects proved to be more prone to new carious lesions than caries-free subjects, who tended to remain caries-free even when they had a high proportion of S. mutans in plaque, thus indicating the basic importance of the host factor in the caries process.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of epidemiology 12 (1996), S. 45-50 
    ISSN: 1573-7284
    Keywords: HCV ; HCV sexual transmission ; HCV intrafamilial transmission ; Spread of HCV ; Epidemiology of HCV
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate the risk of sexual and intrafamilial transmission of HCV, 220 family members of 76 patients (index cases) with chronic type C viral liver disease were tested for serological markers of HCV Of the family members, 129 were offspring, 64 sexual partners, 15 parents and 12 siblings of the index cases. Anti-HCV was tested in all the household contacts; HCV-RNA was tested in antibody positive samples. The serologic markers of HCV were tested in a control group of 168 family members of 81 patients with chronic hepatitis unrelated to HCV. The overall prevalence of anti-HCV was 8.2% compared to 0.6% in the control group (p 〈 0.001). Sexual partners were anti-HCV positive more frequently than the other contacts (20% vs 2.2%; p 〈 0.001), without any difference in males or females. No correlation was observed between the occurrence of HCV infection in contacts and age, severity of liver disease or risk factor for the acquisition of HCV in the index cases. Seven of the 18 (39%) anti-HCV positive family contacts had biochemical evidence of chronic liver disease, histologically confirmed in the 6 patients who underwent a liver biopsy. Liver chemistry was normal in all the HCV-negative contacts. Ten of the 18 anti-HCV positive contacts (55%) were HCV-RNA positive. Genotypes were the same (lb) in 4 of the 7 viremic couples of subjects: in 3 of the 6 couples of sexual partners and in the only mother/son couple. These data suggest the occurrence of intraspousal transmission of HCV, while intrafamiliar acquisition of HCV in non-sexual contacts seems to be rare.
    Type of Medium: Electronic Resource
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