Search PubMed⌕ Search

Biomedical subjects

A Nicoll

Publications and source records attributed to A Nicoll.

At least 73 records · Page 4Linked to original sources
PubMed1998

Epidemiology and detection of HIV-1 among pregnant women in the United Kingdom: results from national surveillance 1988-96.

OBJECTIVE: To describe the epidemiology of HIV-1 infection in pregnant women in the United Kingdom. DESIGN: Serial unlinked serosurveillance for HIV-1 in neonatal specimens and surveillance through registers of diagnosed maternal and paediatric infections from reporting by obstetricians, paediatricians, and microbiologists. SETTING: United Kingdom, 1988-96. SUBJECTS: Pregnant women proceeding to live births and their children. MAIN OUTCOME MEASURES: Time trends in prevalence of HIV-1 seropositivity in newborn infants (as a proxy for infection in mothers); the proportions of mothers with diagnosed HIV-1 infections, and their characteristics. RESULTS: HIV-1 prevalence among mothers in London rose sixfold between 1988 and 1996 (0.19% of women tested; 1 in 520 in 1996). Apart from in Edinburgh and Dundee, levels remained low in Scotland (0.025%; 1 in 3970) and elsewhere in the United Kingdom (0.016%; 1 in 1930). Over a third of births to infected mothers in 1996 occurred outside London. In London the reported infections were predominantly among black African women, whereas in Scotland most were associated with drug injecting. The contribution of reported infection among African women increased over time as that of drug injecting declined. In Scotland 51% of mothers' infections were diagnosed before the birth. In England, despite a national policy initiative in 1992 to increase the antenatal detection rate of HIV, no improvement in detection was observed, and in 1996 only 15% of previously unrecognised HIV infections were diagnosed during pregnancy. CONCLUSIONS: HIV-1 infection affects mothers throughout the United Kingdom but is most common in London. Levels of diagnosis in pregnant women have not improved. Surveillance data can monitor effectively the impact of initiatives to reduce preventable HIV-1 infections in children.

Female↗
PubMed1998

The British Paediatric Surveillance Unit--a pioneering method for investigating the less common disorders of childhood. Report of a seminar held in June 1995.

The British Paediatric Surveillance Unit (BPSU) of the Royal College of Paediatrics and Child Health is an 'active' case reporting scheme set up in 1986 to facilitate the investigation of uncommon childhood conditions of public health and clinical importance in the UK and Ireland. Its methodology involves the monthly mailing of a card containing a menu of up to 12 reportable conditions to all clinically active paediatricians in the British Isles. Respondents either indicate any cases seen in the past month or make a nil return. The BPSU forwards details of respondents reporting cases to the investigators, who when obtain information from the clinician. The menu changes from time to time and studies undergo a rigorous selection process. In 1995, the BPSU held an international seminar to review lessons learned during its first decade which would improve and develop surveillance of paediatric disorders. Over the 9 years to mid-1995 a total of 34 studies took place (25 completed, nine still in progress) with a high respondent response rate (e.g. 90% in 1994). Underascertainment had been addressed by seeking, in parallel, other sources of cases, e.g. death registrations, laboratory reports, other relevant clinical specialists, and by use of capture-recapture techniques. Other specialties and countries have since followed the BPSU example providing opportunity for multispeciality and international studies. The latter were valuable, but required careful planning to standardize case definitions and laboratory techniques, otherwise geographical differences in the incidence of study disorders were difficult to interpret. The BPSU has facilitated studies which increased knowledge about a range of disorders and informed national policy decisions. It also increased diagnostic awareness and showed itself able to respond to public health emergencies. Its emulation in further countries will have similar benefits.

Adolescent↗
PubMed1998

Prevention and control of tetanus in childhood.

Until recently, tetanus was estimated to be killing well over half a million children each year in the developing world, most commonly through neonatal tetanus, the incidence of which was around six per 1000 live births. Neonatal tetanus most commonly occurs through cord contamination of the umbilical stump. Vaccination of pregnant women and infants is an effective and inexpensive intervention that results in major health gains, although educating traditional birth attendants and mothers about safer birthing practices probably also lowers the incidence of tetanus. Recently, however, new vigor and strategies in immunization programs have resulted in substantial improvements. Immunization of pregnant women, and identification and targeting of areas and populations in which neonatal tetanus is occurring are especially effective. Tetanus will continue to be a pediatric problem until vaccination strategies are effectively implemented, surveillance systems are improved, and hygienic birthing practices become standard in all countries.

Child↗
PubMed1998

Prevalence of HIV-1 among attenders at sexually transmitted disease clinics: analyses according to country of birth.

OBJECTIVES: To determine the importance of world region of birth as a risk factor for HIV-1 infection, the likelihood of having an HIV-1 infection diagnosed and the likelihood of having another coexisting acute sexually transmitted infection (STI) among attenders at genitourinary medicine clinics. SUBJECTS: Specimens from attenders having routine syphilis serology at 15 sexually transmitted disease clinics in England, Wales, and Northern Ireland participating in the unliked anonymous seroprevalence monitoring programme from 1994 to 1996. METHODS: Limited data were collected with specimens that were irreversibly unlinked from the source patients before testing for antibodies to HIV-1. Numbers of specimens, the prevalence of HIV-1, the proportions of infections clinically diagnosed, and the presence of coexisting acute STIs were analysed according to world region of birth, sexual orientation, and injecting drug use. RESULTS: Between 1994 and 1996, 173,075 specimens were collected; 16.9% were from people born outside the United Kingdom. Risk of being HIV-1 positive was significantly higher overall for both men and women born abroad, but this was not the case for those born in south Asia (India, Pakistan, and Bangladesh). Homosexual and bisexual males born abroad were almost twice as likely to be HIV infected as their counterparts born in the United Kingdom. However, homosexual and bisexual men born in the United Kingdom accounted for almost three quarters of the 1174 HIV-1 positive specimens detected. Among 158,728 non-drug injecting heterosexuals the highest prevalence was observed in specimens from those men (4.0%) and women (5.8%) born in sub-Saharan Africa. The 6991 heterosexual men and women born in other European countries were also more likely to provide HIV-1 positive specimens than UK born heterosexuals. However, 39% of the HIV-1 positive specimens in heterosexuals come from clinic attenders born in the United Kingdom. Heterosexual males were generally less likely to have their infection diagnosed than females. There were 182 attendances (mostly from London clinics) non-drug injecting heterosexual men and women who were infected with both HIV-1 and an acute sexually transmitted infection; only 12% of whom had had their HIV-1 infection diagnosed. CONCLUSION: Among most people attending genitourinary medicine clinics, being born abroad is associated with an increased likelihood for HIV-1 infection. HIV-1 infected heterosexuals, of whom 46% are people from sub-Saharan Africa, are unlikely to have their infection clinically diagnosed and thus are unable to obtain appropriate treatment. The presence of HIV-1 infected heterosexual men and women with acute STI represents a potential source of heterosexual HIV transmission both for those born in the United Kingdom and born abroad.

Acquired Immunodeficiency Syndrome↗
PubMed1998

Reference laboratory surveillance of syphilis in England and Wales, 1994 to 1996.

Routine surveillance of syphilis of public health importance (infectious, congenital, and neurosyphilis) began in England and Wales in 1994, using reports from six PHLS laboratories that undertook serological and other reference work. One hundred and thirty-one cases were reported in the first two years, including 100 cases of infectious syphilis, with all regions reporting some infectious syphilis. Reports from PHLS laboratories represented one sixth of the number of cases seen in genitourinary clinics (KC60 data), but both systems produced comparable results. Laboratory reports provided more data on risk factors, which were not available elsewhere. This study documents the risk in England and Wales from infections originating in eastern Europe, where sexually transmitted infections including syphilis have reached epidemic proportions. Forty-five per cent of cases of infectious syphilis were reported to have been acquired in the United Kingdom (UK) and 59% of people with infectious syphilis were reported to have been born in the UK. Twenty per cent of the infectious cases were associated directly or indirectly with transmission in Russia or elsewhere in eastern Europe. The majority of infectious cases were from the white ethnic group. Eighty-five per cent of cases of infectious syphilis were reported to have been acquired heterosexually; 26% of male cases were reported to have been acquired homosexually. The PHLS laboratory reporting system is now well established, and could usefully be expanded to include other, non PHLS, laboratories that undertake reference work. It has the capacity to detect changes in the national epidemiology of syphilis, including imported infections.

Adult↗
PubMed1997

Sexually transmitted diseases among teenagers in England and Wales.

A profile of sexually transmitted diseases (STDs) and HIV infections among teenagers in England and Wales was obtained from reports of newly diagnosed STDs among teenagers attending genitourinary medicine (GUM) clinics in 1995, laboratory reports of newly diagnosed HIV infections between 1985 when reporting began and the end of 1995, and the prevalence of HIV (unlinked anonymous programme) among teenagers attending genitourinary medicine clinics and antenatal clinics in 1994 and 1995. STD reports were analysed by sex, age group, and place of residence of patients--whether in the NHS Thames regions or elsewhere in England and Wales. High rates of STDs were reported in teenagers, particularly in girls. The incidences of gonorrhoea, chlamydia infection, and first attack genital wart infections were higher in teenage girls than in any other age group. Boys under 16 years of age had substantially higher rates of infection with all STDs in the Thames regions than elsewhere. Rates of gonorrhoea in teenagers of both sexes in the Thames regions were more than twice those in the rest of the country. Infection rates for genital herpes, and chlamydia in girls, were also higher in the Thames regions, although the geographical differences were less marked. The seroprevalence of HIV among heterosexual teenagers was very low. In contrast, 226 HIV infections among teenage boys had probably been acquired through sexual intercourse with other males. Unlinked anonymous testing revealed HIV antibody in 7.5% of routinely collected serology specimens taken from teenage homosexual or bisexual males attending GUM clinics in London. The high rates of STDs among teenage girls and all teenagers in the Thames regions make these groups a high priority for sexual health promotion, with special consideration given to homo/bisexual male teenagers. Detailed surveillance of risk factors for STDs, and further studies of teenage sexual behaviour will help to effectively target resources to improve the sexual health of teenagers in England and Wales.

Adolescent↗
PubMed1997

The influence of demographic change and cumulative risk of pelvic inflammatory disease on the incidence of ectopic pregnancy.

A retrospective study was carried out to determine the recent epidemiology of ectopic pregnancy in England between the biennial years 1988/9 and 1992/3. The number of ectopic pregnancy cases were combined with numbers of conceptions and the rates analysed for trend over time. The incidence of ectopic pregnancy rose significantly (P = 0.05) over this period. However, this could be entirely explained by increasing numbers of births in older women and a highly significant positive association was found between risk of ectopic pregnancy and maternal age (P < 0.0001). Over the study period the incidence of ectopic pregnancy in women aged 40 years or more was over 14 times that observed in those under 16 years of age. It is suggested that this reflects cumulative risk of acquiring pelvic inflammatory disease. The surveillance of ectopic pregnancy provides a useful indicator of the level of reproductive morbidity in women.

Adolescent↗
PubMed1997

Uptake of interventions to reduce mother-to-child transmission of HIV in the United Kingdom and Ireland.

OBJECTIVES: To describe the uptake of interventions to reduce mother-to-child transmission of HIV infection. DESIGN: Voluntary confidential reporting of HIV infection in pregnancy and childhood; telephone interview with key professionals in all London maternity units. SUBJECTS AND SETTING: HIV-infected pregnant women and children in the United Kingdom and Ireland. MAIN OUTCOME MEASURES: Trends in breastfeeding, use of zidovudine, mode of delivery and terminations of pregnancy. RESULTS: Between 1990 and 1995, 14 (4%) out of 314 women diagnosed with HIV infection before delivery breastfed compared with 109 (77%) out of 142 diagnosed after delivery. Since 1994, zidovudine use has increased in each 6-month period (14, 39, 67, and 75%; chi 2 = 17.5, P < 0.001), although in 1995 it was the policy of only 48% of London maternity units to offer zidovudine to HIV-infected women. During 1995, 44% of HIV-infected women were delivered by elective Cesarean section. Since 1990, 20% of women first diagnosed in pregnancy were reported to have their pregnancy terminated. CONCLUSIONS: Although detection of previously undiagnosed HIV infection in pregnancy remains low in the United Kingdom, and particularly in London, HIV-infected pregnant women who are aware of their status are increasingly active in taking up interventions to reduce transmission to their infants. If all HIV-infected women attending for antenatal care in London consented to testing and took up interventions and termination of pregnancy at the rates observed in this study, the number of vertically infected babies born in London each year could be reduced from an estimated 41 to 13.

Abortion, Induced↗
PubMed1997

Budd-Chiari syndrome: intractable ascites managed by a trans-hepatic portacaval shunt.

Transjugular intrahepatic portosystemic shunts (TIPS) have recently been used to manage the portal hypertensive complications of the Budd-Chiari syndrome. We report this application of TIPS (to our knowledge the first such application in Australia) in a young man with an excellent result and no major complications. This treatment offers an alternative to portacaval shunt surgery and has the advantage of bypassing a stenosed or compressed inferior vena cava. Additionally, the procedure does not complicate liver transplantation surgery if this is indicated at a later date.

Adult↗
PubMed1997

Review: Present and future directions in the treatment of chronic hepatitis B infection.

The last decade has witnessed substantial progress in the development of chemotherapeutic agents for chronic hepatitis B. However, the only currently licensed treatment in Australia, interferon-alpha, has low initial response rates and the adverse effects are often unacceptable. Of the newer agents in the class of nucleoside analogues, famciclovir and lamivudine are in phase III clinical trials with encouraging preliminary results, while other agents, such as bis-POM PMEA (Adefovir), are at phase I/II development. Future approaches to therapy will be governed by an understanding of the effects of nucleoside analogues on the natural history of the disease as well as on the hepatitis B virus hepatocyte interaction. Combination antiviral therapy should theoretically offer improved response rates, decrease the development of viral resistance, and provide the greatest reduction in viral load, but it has not yet been widely examined in the clinical setting. In this article, we review the currently available strategies, discuss potential problem areas, and speculate on promising approaches with combination chemotherapy and the features of agents soon to be trialed.

Antiviral Agents↗