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Halperin S.A.,Dalhousie University | Bettinger J.A.,University of British Columbia | Greenwood B.,London School of Hygiene and Tropical Medicine | Harrison L.H.,University of Pittsburgh | And 4 more authors.
Vaccine | Year: 2012

The epidemiology of invasive meningococcal disease continues to change rapidly, even in the three years since the first Meningococcal Exchange Meeting in 2008. Control of disease caused by serogroup C has been achieved in countries that have implemented meningococcal C or quadrivalent meningococcal ACWY conjugate vaccines. Initiation of mass immunization programs with meningococcal A conjugate vaccines across the meningitis belt of Africa may lead to the interruption of cyclical meningococcal epidemics. A meningococcal B vaccination program in New Zealand has led to a decreased incidence of high rates of endemic serogroup B disease. Increases in serogroup Y disease have been observed in certain Nordic countries which, if they persist, may require consideration of use of a multiple serogroup vaccine. The imminent availability of recombinant broadly protective serogroup B vaccines may provide the tools for further control of invasive meningococcal disease in areas where serogroup B disease predominates. Continued surveillance of meningococcal disease is essential; ongoing global efforts to improve the completeness of reporting are required. © 2011 Elsevier Ltd.

Buttery J.P.,Murdoch Childrens Research Institute | Buttery J.P.,Royal Melbourne Hospital | Buttery J.P.,Monash University | Danchin M.H.,Murdoch Childrens Research Institute | And 12 more authors.
Vaccine | Year: 2011

Introduction: In Australia, post-marketing surveillance for intussusception following vaccination commenced with funding of RotaTeq® and Rotarix® vaccines under the National Immunization Program (NIP) in July 2007. Methods: Two active surveillance mechanisms (hospital-based case ascertainment and monthly reports from paediatricians) identified intussusception cases between 1st July 2007 and 31st December 2008 in four states. Linkage to vaccination records identified cases occurring within 1-7 and 1-21 days of rotavirus vaccination. Expected cases within the post-vaccination windows were calculated by applying rates of intussusception from national hospitalisation data over 6 years (mid-2000 to mid-2006), by age and state, to numbers vaccinated (by dose) according to the Australian Childhood Immunization Register. Results: Combining exposure windows associated with all doses of rotavirus vaccine from 1 to 9 months of age, there was no evidence of an increased risk of intussusception following vaccination for either vaccine. However, in infants 1 to <3 months of age, there was suggestive evidence of excess intussusception cases 1-7 and 1-21 days following dose 1 (1-7 days: RotaTeq® relative risk (RR)=5.3, 95% confidence interval [CI] 1.1,15.4; Rotarix® RR 3.5, 95% CI 0.7,10.1; 1-21 days: RotaTeq® RR 3.5, 95% CI 1.3, 7.6; Rotarix®RR 1.5, 95% CI 0.4, 3.9). There was no evidence that clinical outcome of intussusception occurring within 21 days of rotavirus vaccination differed from that in cases occurring later post-vaccination. Conclusion: Although we found no overall increase in intussusception following receipt of rotavirus vaccine, there was some evidence of an elevated risk following the first dose of both vaccines. Larger population-based studies using linked databases are required to provide more definitive evidence. © 2011 Elsevier Ltd.

Maher L.,NSW Public Health Officer Training Program | Maher L.,University of New South Wales | Hope K.,South Western Sydney and Sydney Local Health Districts Public Health Unit | Torvaldsen S.,University of New South Wales | And 7 more authors.
Vaccine | Year: 2013

Background: Pregnant women have an increased risk of complications from influenza. Influenza vaccination during pregnancy is considered effective and safe; however estimates of vaccine coverage are low. This study aimed to determine influenza vaccination coverage and factors associated with vaccine uptake in pregnant women in two Sydney-based health districts. Methods: A random sample of women who delivered a baby in a public hospital in Sydney and South-Western Sydney Local Health Districts between June and September 2012 were surveyed using a computer assisted telephone interviewing service. Results: Of the 462 participants (participation rate 92%), 116 (25%) reported receiving the influenza vaccine during their pregnancy. In univariate analysis, vaccination coverage varied significantly depending on antenatal care type, hospital of birth, and parity (p<0.05), but not for age category, highest level of education, country of birth, language spoken at home, or Aboriginal status. Women who received antenatal care through a general practitioner (GP) had 2.3 (95% CI 1.4-3.6) times the odds (unadjusted) of receiving the influenza vaccination than those who received their antenatal care through a public hospital. The main reason cited for vaccination was GP recommendation (37%), while non-recommendation (33%) and lack of knowledge (26%) were cited as main reasons for not receiving the vaccination. 30% of women recalled receiving a provider recommendation for the vaccination and these women had 33.0 times the odds (unadjusted) of receiving the vaccination than women who had not received a recommendation. In a multivariate model a provider recommendation was the only variable that was significantly associated with vaccination (OR 41.9; 95% CI 20.7-84.9). Conclusion: Rates of influenza vaccination during pregnancy are low. There is a significant relationship between healthcare provider recommendation for the vaccination and vaccine uptake. Increasing provider recommendation rates has the potential to increase coverage rates of influenza vaccination in pregnant women. © 2013 Elsevier Ltd.

Georgousakis M.,National Center for Immunisation Research and Surveillance | Jayasinghe S.,National Center for Immunisation Research and Surveillance | Brotherton J.,National HPV Vaccination Program Register | Brotherton J.,University of Sydney | And 6 more authors.
The Lancet Infectious Diseases | Year: 2012

Female-only vaccination programmes for human papillomavirus (HPV) have been introduced in many countries aimed at the prevention of cervical cancer in women. One HPV vaccine is registered for male vaccination, but boys, men, or both, are not yet included in nationally funded HPV vaccination programmes. In this Review we discuss the different considerations relevant to the introduction of population-wide HPV vaccination of boys in Australia, which was the first country to publicly fund HPV vaccination of girls. Several factors need to be taken into account during decision making around the introduction of population-based vaccination programmes, such as local disease burden, vaccine efficacy, vaccine safety, and cost-effectiveness. Social and ethical factors are also important. Although evidence for men is increasing in these areas, uncertainties need to be kept in mind. The features discussed in this Review are likely to be applicable, with caveats, to policy making in other developed countries. © 2012 Elsevier Ltd.

Wood J.G.,University of New South Wales | Heywood A.E.,University of New South Wales | Menzies R.I.,National Center for Immunisation Research and Surveillance | Menzies R.I.,University of Sydney | And 3 more authors.
Vaccine | Year: 2015

Introduction: Australia has achieved measles elimination as announced in March 2014 by the WHO Western Pacific Regional Committee, based on several lines of evidence. However, despite strong national evidence for elimination, there remains substantial regional variation in vaccine coverage, has resulted in recent outbreaks and potential for increased frequency in the future. Methods: In this study, we apply a multiple cohort model of measles immunity, stratified by age and local geographic area to predict trends in the measles reproduction number R. In addition, we use branching process models of outbreak risks to predict state-level probabilities of the occurrence of measles outbreaks over the next 20 years. Results: Our results suggest increasing risks of large measles outbreaks over this period, in particular in the states of Queensland and New South Wales. In addition, there is wide variation in predicted R values by smaller geographic areas, although uncertainty in age-specific immunity limits the precision of our results. Discussion: Our predictions align with observed outbreaks in Australian states and suggest our approach to determining future outbreak risks could be applied more widely in elimination or near-elimination settings. © 2014 Elsevier Ltd.

Davey H.M.,Center for Epidemiology and Evidence | Muscatello D.J.,Center for Epidemiology and Evidence | Wood J.G.,University of New South Wales | Snelling T.L.,The Telethon Kids Institute | And 4 more authors.
Vaccine | Year: 2015

Introduction: Australia was one of the first countries to introduce nationally funded rotavirus vaccination. The program has had a substantial impact on both rotavirus and all-cause acute gastroenteritis (AGE) hospitalisations and rotavirus laboratory tests. Evidence for an impact on Emergency Department (ED) presentations is limited. This study assessed changes in ED presentations for rotavirus in children aged <5 years in New South Wales, Australia, following introduction of monovalent human rotavirus vaccine (RV1, Rotarix®, GlaxoSmithKline Australia Pty Ltd., Victoria, Australia). Method: A time series analysis to examine trends in total non-admitted ED presentations for all-cause AGE and in the rotavirus-attributable fraction using data on rotavirus positive laboratory tests. Results: A decline in the rate of non-admitted ED presentations for all-cause AGE was observed for all ages, being most notable in 1 year old children. Compared with the pre-vaccination period, we estimated the average weekly rate was lower across the first 4.5 years of the program for both all-cause AGE (18.3%; 70.5 versus 57.5 per 100,000 population) and rotavirus attributable (55.4%; 17.3 versus 7.7 per 100,000 population) presentations. In the fourth year of the program, estimated annual rotavirus attributable presentations were 77% lower than the pre-vaccination annual mean (996 versus 4300 per year). Conclusion: The program was associated with a substantial decline in rotavirus attributable non-admitted AGE presentations to ED among children aged <5 years. © 2015.

Sheridan S.L.,University of Queensland | McCall B.J.,Metro South Public Health Unit | Davis C.A.,Communicable Diseases Unit | Robson J.M.B.,Sullivan Nicolaides Pathology | And 6 more authors.
Medical Journal of Australia | Year: 2014

Objectives: To assess the effectiveness of three, four and five doses of acellular pertussis vaccine against pertussis notification for children aged 1 - < 4 years and 5 - < 12 years, and the effectiveness of three doses of acellular pertussis vaccine against pertussis hospitalisation for children aged 1 - < 4 years. Design, setting and participants: A population-based retrospective study of children aged 1 - < 12 years residing in Queensland, Australia, during 2009 and 2010. Routinely collected notification, hospitalisation, testing and vaccination data were used to describe notification rates and testing patterns and to assess vaccine effectiveness (VE) by the screening method. Main outcome measures: VE against pertussis notification for children aged 1 - < 4 years and 5 - < 12 years, by birth year, and VE against pertussis hospitalisation for children aged 1 - < 4 years. Results: 1961 notifications and 29 hospitalisations were included in the VE calculations. VE point estimates against pertussis notification and hospitalisation in children aged 1 - < 4 years were similar in 2009 and 2010, and ranged between 83.5% and 89.4%. VE point estimates against notification among children aged 5 - < 12 years were between 71.2% and 87.7% in 2009, and between 34.7% and 70.3% in 2010. The numbers of pertussis tests performed for children, particularly polymerase chain reaction (PCR) tests, increased between 2009 and 2010. Conclusions: Acellular pertussis vaccine provided good protection within the first years of priming, but this waned as age increased. Changes in pertussis testing behaviour, because of increases in PCR use and awareness, may have contributed to increased pertussis notification rates and lower estimates of VE against notification owing to identification of milder disease.

Cooper Robbins S.C.,University of Sydney | Cooper Robbins S.C.,National Center for Immunisation Research and Surveillance | Ward K.,National Center for Immunisation Research and Surveillance | Skinner S.R.,University of Sydney
Vaccine | Year: 2011

Objective: School-based vaccination is becoming a more widely used method of vaccine delivery. However, evaluations of school-based vaccination program implementation have not been systematically reviewed. This paper describes the results of a systematic review of the literature on process (or implementation) evaluations of school-based vaccination delivery. Methods: Search terms: "school based vaccination" OR ((" schools" OR "school") AND (" immunisation" OR "immunization" OR "vaccination")). Limits: Humans; English language; Age: 6-18 (school-age children and adolescents); No editorials; No letters. Databases: PUBMED; Embase.com; Cochrane Database of Systematic Reviews; Cinahl; Web of Science; PsycINFO. Inclusions: Articles must have originated from an advanced economic 'developed' country, be peer-reviewed, available in English, randomised or non-randomised controlled design, published from 1970 to August 2010 and focused on vaccinations provided in the school setting and during school time which reported one or more outcomes. Exclusions: qualitative or descriptive papers without any evaluation component; papers that only reported on impact evaluation (i.e. number of students vaccinated); and those published before 1970. Results: A total of 14 articles were identified as including some element of a process evaluation of a school-based vaccination program. Nurses, parents, teachers, and adolescents were involved in measures of procedural factors related to school-based vaccination implementation. Outcomes included return rates of consent forms; knowledge about the specific vaccine offered; attitudes toward vaccination and school-based vaccination; reasons for non-vaccination; resources, support, and procedures related to implementation; and environmental factors within the school that may impact vaccination success. Vaccination coverage was also reported in the majority of papers. Conclusions: Many studies reported on the importance of ensuring all stakeholders (school nurses, parents, teachers, and adolescents) receive appropriate information and are involved in the vaccination program and implementation processes. Specific consent form dissemination procedures have demonstrated higher return rates. Further controlled studies are needed to determine the best practice approach to implementing these programs is a variety of contexts. © 2011 Elsevier Ltd.

Dey A.,National Center for Immunisation Research and Surveillance | Dey A.,University of Sydney | Wang H.,National Center for Immunisation Research and Surveillance | Menzies R.,National Center for Immunisation Research and Surveillance | And 3 more authors.
Medical Journal of Australia | Year: 2012

Objective: To evaluate the impact of the Australian rotavirus vaccination program on both rotavirus and all-cause acute gastroenteritis (AGE) hospitalisations and to compare outcomes in Indigenous and non-Indigenous people. Design and setting: Retrospective analysis of the Australian Institute of Health and Welfare National Hospital Morbidity database for hospitalisations coded as rotavirus and all-cause AGE, between 1 July 2001 and 30 June 2010. Main outcome measures: Age-specific hospitalisation rates in Indigenous and non-Indigenous people, before and after the introduction of the vaccine program in July 2007. Results: There was a 71% decline in rotavirus-coded hospitalisations of children aged < 5 years between periods before and after rotavirus vaccination (from 261 per 100 000 to 75 per 100 000). There was also a 38% decline in non-rotavirus coded AGE hospitalisations (from 1419 per 100000 to 880 per 100000). This represented more than 7700 hospitalisations of children aged < 5 years being averted in the financial year 2009–10. Reductions were also observed in the 5–19-years age group, suggesting that transmission of virus was reduced at a population level. Decreases in hospitalisations of Indigenous children were smaller than those for the general population, and fluctuated by location and year. Conclusions: These data show a sustained and substantial decline in severe rotavirus disease and all-cause AGE since the introduction of rotavirus vaccination, most pronounced in the target age group, but with evidence of herd immunity. The impact of rotavirus vaccination in Indigenous children in hyperendemic settings was less remarkable. © 2012, Australasian Medical Publishing Co. Ltd. All rights reserved.

Jayasinghe S.,National Center for Immunisation Research and Surveillance | Jayasinghe S.,University of Sydney | Macartney K.,National Center for Immunisation Research and Surveillance | Macartney K.,The Childrens Hospital at Westmead | Macartney K.,University of Sydney
Vaccine | Year: 2013

Introduction: Hospital discharge records and laboratory data have shown a substantial early impact from the rotavirus vaccination program that commenced in 2007 in Australia. However, these assessments are affected by the validity and reliability of hospital discharge coding and stool testing to measure the true incidence of hospitalised disease. The aim of this study was to assess the validity of these data sources for disease estimation, both before and after, vaccine introduction. Methods: All hospitalisations at a major paediatric centre in children aged <5 years from 2000 to 2009 containing acute gastroenteritis (AGE) ICD 10 AM diagnosis codes were linked to hospital laboratory stool testing data. The validity of the rotavirus-specific diagnosis code (A08.0) and the incidence of hospitalisations attributable to rotavirus by both direct estimation and with adjustments for non-testing and miscoding were calculated for pre- and post-vaccination periods. Results: A laboratory record of stool testing was available for 36% of all AGE hospitalisations (. n=. 4948) the rotavirus code had high specificity (98.4%; 95% CI, 97.5-99.1%) and positive predictive value (96.8%; 94.8-98.3%), and modest sensitivity (61.6%; 58-65.1%). Of all rotavirus test positive hospitalisations only a third had a rotavirus code. The estimated annual average number of rotavirus hospitalisations, following adjustment for non-testing and miscoding was 5- and 6-fold higher than identified, respectively, from testing and coding alone. Direct and adjusted estimates yielded similar percentage reductions in annual average rotavirus hospitalisations of over 65%. Conclusion: Due to the limited use of stool testing and poor sensitivity of the rotavirus-specific diagnosis code routine hospital discharge and laboratory data substantially underestimate the true incidence of rotavirus hospitalisations and absolute vaccine impact. However, this data can still be used to monitor vaccine impact as the effects of miscoding and under-testing appear to be comparable between pre and post vaccination periods. © 2012 Elsevier Ltd.

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