The impact of a vaccine mandate and the COVID-19 pandemic on influenza vaccination uptake in Western Australian health care students.

Annual influenza vaccination of health care students and workers helps protect themselves and patients from influenza, which has a high disease burden during seasonal peaks in Australia. Health care students are an important cohort whose early attitudes and habits towards influenza vaccination may influence future behaviours. We explored the knowledge, attitudes, and behaviours towards influenza vaccination of health care students in two universities from 2018 to 2020 using convergent mixed methodology. We also assessed the impact of two external events - the introduction of mandatory influenza vaccination for select students in 2019, and the COVID-19 pandemic in 2020. We found a significant increase in self-reported vaccination uptake between 2018 (73.5%) and 2020 (89.6%), with the mandate and COVID-19 pandemic being likely drivers of increased uptake. Vaccine mandates are effective but must be supported by easy accessibility, adequately addressing concerns around effectiveness and safety, and promotion of voluntary acceptance and trust.

Long-term impact of childhood hepatitis B vaccination programs on prevalence among Aboriginal and non-Aboriginal women giving birth in Western Australia.

BACKGROUND/AIMS: To evaluate the long-term effect of infant and childhood hepatitis B (HBV) vaccination programs among birthing women in Western Australia. METHODS: A cohort of Western Australian women born from 1974 to 1995 was created using Birth Registrations and Electoral Roll records. They were linked to a perinatal register and notifiable diseases register to identify women having respectively their first births between 2000 and 2012 and diagnoses of HBV infections. HBV prevalence was estimated in Aboriginal and non-Aboriginal women, and according to maternal birth year cohorts. RESULTS: Of 66,073 women, 155 (0.23%) had a linked non-acute HBV notification. HBV prevalence was five times higher in Aboriginal women compared to their non-Aboriginal counterparts (0.92%, 95%CI 0.65-1.18 versus 0.18%, 0.15-0.21). Among Aboriginal women, after adjusting for year of giving birth and region of residence, those born in the targeted infant and school-based vaccination era (maternal year of birth 1988-1995) had an 89% lower risk (adjusted odds ratio [aOR] 0.11, 0.04-0.33) of HBV than those born in the pre-vaccination era (1974-1981). Prevalence also differed between Aboriginal women residing in rural/remote areas compared to those in major cities (aOR 3.06, 1.36-6.88). Among non-Aboriginal women, no significant difference in HBV prevalence was observed by maternal birth cohort (p = 0.20) nor by residence (p = 0.23), but there were significant differences by ethnicity with a 36-fold higher prevalence (aOR 36.08, 22.66-57.46) in non-Caucasian versus Caucasian women. CONCLUSIONS: A significant decline in HBV prevalence in Aboriginal birthing mothers was observed following the introduction of HBV vaccination programs in Western Australia. There were also considerable disparities in prevalence between women by area of residence and ethnicity. Our findings reflect those observed in women in other Australian jurisdictions. Continued surveillance of HBV prevalence in birthing mothers will provide ongoing estimates of HBV vaccination program impact across Australia and the populations most at risk of chronic HBV.

Comparison of text-messaging to voice telephone interviews for active surveillance of adverse events following immunisation.

OBJECTIVES: In 2013, the Follow-up and Active Surveillance of Trivalent Influenza Vaccine in Mums (FASTMum) program began using short message service (SMS) to collect adverse event information in pregnant women who recently received trivalent influenza vaccine (TIV). This study was designed to compare data collected via SMS and telephone for the purposes of monitoring vaccine safety. METHODS: A number of 344 women who received TIV were randomly assigned to a telephone interview group. They were telephoned seven days post-vaccination and administered a standard survey soliciting any adverse events following immunisation (AEFI) they experienced. They were matched by brand of vaccine, age group, and residence to 344 women who were sent a SMS seven days post-vaccination. The SMS solicited similar information. AEFI reported by SMS and telephone interview were compared by calculating risk ratios. RESULTS: Response rate was higher to SMS compared to telephone interview (90.1% vs. 63.9%). Women who were surveyed by SMS were significantly less likely to report an AEFI compared to women who were surveyed by telephone (RR: 0.41; 95% CI: 0.29-0.59). The greatest discrepancies between SMS and telephone interview were for self-reported injection site reactions (3.1% vs. 16.8%) and unsolicited (or "other") events (11.4% vs. 4.1%). Data collected by SMS was significantly timelier. CONCLUSIONS: Data collection by SMS results in significantly improved response rates and timeliness of vaccine safety data. Systems which incorporate SMS could be used to more rapidly detect safety signals and promote more rapid public health response to vaccine quality issues.

'I am absolutely shattered': the impact of chronic low back pain on Australian Aboriginal people.

BACKGROUND: Aboriginal people in Australia have been uniquely identified as less susceptible to chronic low back pain (CLBP) disability when compared to non-Aboriginal populations, reportedly due to cultural beliefs about pain. A qualitative, culturally secure research approach was used to explore this assumption. METHODS: In-depth interviews were undertaken with 32 Aboriginal men and women with CLBP in regional and remote areas of Western Australia. Interviews were conducted collaboratively with male and female Aboriginal co-investigators, and with the support of local Aboriginal community organizations. A primary focus was to investigate the impact of CLBP from the perspective of Aboriginal people living with the condition. RESULTS: The experience of CLBP was found to be multidimensional, impacting on activities of daily life, employment, sport and family participation, emotional and cultural well-being. CONCLUSIONS: Contrary to previous assumptions, CLBP is profoundly disabling for some Aboriginal people and a priority health concern. Issues of gender, cultural obligations and the emotional consequences of CLBP are important consideration for health care. These findings, and the contextual approach used to gain an in-depth understanding of CLBP, may be relevant to populations elsewhere.

Secondary attack rate of pandemic influenza A(H1N1) 2009 in Western Australian households, 29 May-7 August 2009.

Understanding household transmission of the pandemic influenza A(H1N1)2009 virus, including risk factors for transmission, is important for refining public health strategies to reduce the burden of the disease. During the influenza season of 2009 we investigated transmission of the emerging virus in 595 households in which the index case was the first symptomatic case of influenza A(H1N1)2009. Secondary cases were defined as household contacts with influenza-like illness (ILI) or laboratory-confirmed influenza A(H1N1)2009, occurring at least one day after but within seven days following symptom onset in the index case. ILI developed in 231 of the 1,589 household contacts, a secondary attack rate of 14.5% (95% confidence interval (CI): 12.9­16.4). At least one secondary case occurred in 166 of the 595 households (a household transmission rate of 27.9%; 95% CI: 24.5­31.6).Of these, 127 (76.5%) households reported one secondary case and 39 (23.5%) households reported two or more secondary cases. Secondary attack rates were highest in children younger than five years (p=0.001), and young children were also more efficient transmitters (p=0.01). Individual risk was not associated with household size. Prophylactic antiviral therapy was associated with reduced transmission (p=0.03). The secondary attack rate of ILI in households with a confirmed pandemic influenza A(H1N1)2009 index case was comparable to that described previously for seasonal influenza.

Association between 2009 seasonal influenza vaccine and influenza-like illness during the 2009 pandemic: preliminary results of a large household transmission study in Western Australia.

We conducted a prospective household transmission study to examine whether receipt of 2009 trivalent influenza vaccine (TIV) was associated with increased risk of influenza-like illness (ILI) among contacts of confirmed pandemic influenza A(H1N1) 2009 patients. In the week following onset of pandemic illness in a household member, 46 (15%) of 304 TIV-vaccinated contacts, and 174 (15%) of 1,162 unvaccinated contacts developed ILI (p=0.95). Receipt of 2009 TIV had no effect on one's risk of pandemic illness.

A syphilis outbreak in remote Australia: epidemiology and strategies for control.

This paper describes the epidemiology of a syphilis outbreak in remote Australia, and explores contributing factors and control strategies. Between 1 August 2000 and 31 January 2002, 74 cases of early syphilis (42 female, 32 male) were identified in 73 Kimberley residents. Syphilis rates in age groups 10-19 and 20-29 years were 583 and 439 per 100000 person years respectively. Factors contributing to the outbreak included incompleteness of sexually transmitted infection (STI) clinical management, untimely contact tracing, staffing and management issues, and poor community knowledge about STIs. Outbreak control strategies addressed factors that could be influenced by changes in health service delivery, and focused on providing education and support to health staff, and efforts to increase community knowledge about sexual health. Although some improvements have occurred, the outbreak is still continuing. Until open and honest discussion and a collaborative approach is taken toward STI problems affecting Indigenous Australians, outbreaks such as this will continue to occur.

Where the data are deficient: a field evaluation of the effectiveness of pneumococcal vaccination in remote Australia.

The aims of the study were to: (i) determine whether a field evaluation of a pneumococcal vaccination program conducted in 1991-1993 could show whether the program was effective; and (ii) to describe the epidemiology of invasive pneumococcal disease using laboratory surveillance data. As part of quality assurance, we undertook a retrospective cohort study to compare the hospitalisation and mortality rates of a pneumococcal-vaccine-vaccinated and an unvaccinated group and a correlational study to compare the before- and after-vaccination hospitalisation rates for the vaccinated and unvaccinated groups. We used laboratory data to describe the epidemiology of invasive pneumococcal disease. The cohort study consisted of 815 subjects (306 vaccinated, 509 comparison). No significant differences were observed in the admission rates for pneumonia and lower respiratory tract infection between the two groups. By using a correlational study, we examined before- and after-vaccination hospitalisation rates and this also failed to reveal any differences, except for persons aged 50 years and older. Laboratory surveillance of invasive disease demonstrated that children younger than 6 years and adults younger than 50 years with alcohol-related problems accounted for most of the cases. Despite the study's limitations, it supports the use of pneumococcal vaccine in persons aged older than 50 years, while at the same time highlighting the ongoing need for better vaccines, especially for children and those aged younger than 50 years with medical conditions predisposing to pneumococcal disease.

A large outbreak of conjunctivitis caused by a single genotype of Neisseria gonorrhoeae distinct from those causing genital tract infections.

Several epidemics of gonococcal conjunctivitis have occurred in Aboriginal populations in Central Australia. In 1997, the first outbreak in the Kimberley region of Western Australia occurred, spreading to Central Australia with a total of 447 cases. A genotyping method was applied directly to DNA extracted from patient samples to characterize the gonococcus causing the epidemic and to compare it with contemporaneous genital isolates. Those positive conjunctival specimens from Kimberley and Central Australia that could be genotyped were all indistinguishable, but were distinct from the genital gonococci, even when they shared the same auxotype and serotype. This suggested that the outbreak was due to a single genotype of Neisseria gonorrhoeae that had probably been carried between communities by infected individuals. We did not find evidence to support the existence of a genital reservoir of the types causing epidemic gonococcal conjunctivitis.

Trichiasis in Aboriginal people of the Kimberley region of Western Australia.

BACKGROUND: Trachoma is a significant public health problem in the Kimberley region of Western Australia. The prevalence of follicular trachoma in the region has been well documented and control of active trachoma is well established. In contrast, trichiasis prevalence in recent years is less well documented. This study aimed to determine trichiasis prevalence in the Kimberley population and to document an appropriate intervention. METHODS: A collaborative programme was established involving the Kimberley Public Health Unit, Kimberley Aged Care Services and the visiting ophthalmology service. After training, medical students screened the aged-care population for trichiasis and the aged-care services staff were educated about identification and referral procedures for patients with trichiasis. The Kimberley Public Health Unit was responsible for ensuring specialist assessment, and correction, of trichiasis and appropriate post-treatment follow up. RESULTS: A total of 597 Kimberley Aboriginal people aged 50 years or more were screened for trichiasis, representing 42% of that age group. Trichiasis was suspected in 40 people. Of the 28 people with suspected trichiasis who underwent ophthalmological assessment, 17 were found to have trachomatous trichiasis. The observed prevalence of trachomatous trichiasis was 2.8%. The trichiasis screening programme has been adopted by most aged-care organizations in the Kimberley. CONCLUSIONS: The results show that trichiasis continues to affect elderly Aboriginal people, especially those from Halls Creek Shire. Health professionals and aged-care workers should be alert to the possibility of this preventable cause of blindness and work collaboratively to ensure that patients receive timely and appropriate treatment.

STDs aren't sexy: health professionals' lack of adherence to clinical guidelines in an area of high STD endemicity.

BACKGROUND: In 1997 the Health Department of Western Australia distributed clinical guidelines aimed at improving the outcomes of care of patients with STDs. In recognition of the high STD rates and issues peculiar to the Kimberley region, a Kimberley Supplement was inserted into copies distributed in the region. Since then, annual STD workshops have been conducted for all Kimberley health professionals involved in any aspect of STD management. This study aimed to assess whether health professionals were observing the Guidelines and its Kimberley Supplement, and whether adherence improved after the 1998 Kimberley STD workshop tour. METHODS: Over two periods, pre- and post-STD workshops, all pathology request forms for gonorrhoea and chlamydia tests were collected from all laboratories in the region. The outcomes of interest were which of the recommended tests had been requested. Logistic regression was used to analyse associations between adherence to the Guidelines and patient's age, sex and postcode, profession of practitioner, reason for testing and whether the test was performed pre- or post-STD workshops. RESULTS: Minimum appropriate tests were ordered on only 14.5 per cent (98/676) of request forms. Univariate and multivariate analyses showed that minimum appropriate testing was more likely to have been requested on male patients and if the practitioner was a doctor. No improvement was observed after the STD workshops. CONCLUSION: The poor adherence and lack of improvement observed can be explained by Kotter's framework on why transformation efforts fail. This study demonstrates that clinical guidelines are of little value unless they are continuously evaluated.

A decision to end a periodic syphilis-screening program in the Kimberley region.

Syphilis rates in the Kimberley region of far-northern Western Australia are among the highest in the nation. In 1986, a formal program of periodic syphilis screening was established. Decreasing syphilis rates since the early 1990s prompted, in 1999, re-evaluation of the value of periodic screening. All confirmed cases of syphilis identified in the Kimberley between January 1996 and early December 1999 as a result of syphilis serology were classified by reason for the test and staged according to disease progression. During the study period, 196 cases of syphilis (117 male, 79 female) were diagnosed; 14 (7.1%) were primary, 32 (16.3%) secondary and 150 (76.5%) latent. The periodic screening program contributed only about 10 per cent of cases, whereas testing as a result of sexually transmitted disease symptoms, sexually transmitted disease contact, institutional screening and other screening contributed the remaining cases. In January 2000, the periodic syphilis-screening program was discontinued. The effect of this policy change will be closely monitored using indicators to ensure that, should the decision not to screen prove to have been misjudged, any increase in syphilis incidence is detected early and managed appropriately.

The contribution of community health surveys to aboriginal health in the 1990s.

Community health surveys take place in many Aboriginal communities. We considered these surveys to determine their potential to contribute to Aboriginal health in the 1990s. Community health surveys--also known as health audits, community health screenings or check-ups--usually consist of a team of health professionals travelling to an Aboriginal community to measure a wide variety of parameters on as many of the people in the community as possible. For the individual participant, community health surveys represent a sporadic screening program which should meet the World Health Organization's criteria for screening. From the population health perspective, these surveys represent prevalence surveys which may contribute little new knowledge regarding Aboriginal health and do not, of themselves, change the urgent need for preventive health programs. Community health surveys should meet minimum scientific standards (i.e. have a clearly stated aim and use valid measurements and statistical techniques) and should incorporate practically feasible protocols and services for the follow-up of individuals with screen-detected abnormalities. They must have ethical and community approval and incorporate genuine consultation and feedback of results to the Aboriginal communities involved, in order for them to be justified.

Age at first episode of venereal syphilis in an aboriginal population: an application of survival analysis.

OBJECTIVE: To identify the age at which screening for syphilis could be ceased in Kimberley Aboriginal people who had remained seronegative and whether this age was the same for people with and without a past history of gonorrhea. DESIGN: Retrospective cohort study. SETTING: The Kimberley region in the far north of Western Australia. PARTICIPANTS: Kimberley Aboriginal residents. MAIN OUTCOME MEASURE: Age at seroconversion. RESULTS: Survival analysis showed that seroconversion due to venereal syphilis occurred largely during the years between the late teens and early 20s. The probability of seroconverting by a given age was related to the time at which the subject's last gonorrhea infection occurred. CONCLUSIONS: As a result of this study, annual periodic screening for syphilis is now offered to Kimberley Aboriginal people only between the ages of 15 and 25 years, allowing for the redistribution of resources to other activities that have greater potential to decrease the incidence of all STDs.

The Fitzroy Valley Pap Smear Register. Cervical screening in a population of Australian aboriginal women.

OBJECTIVE: To describe the operation of the Fitzroy Valley Pap Smear Register, a population-based call and recall system for cervical screening for Aboriginal women, and the prevalence of cervical abnormalities in the women screened. DESIGN: Descriptive study. SETTING: An Aboriginal community in the far north-west of Western Australia. PARTICIPANTS: Aboriginal women aged 15 to 69 years, living in the Fitzroy Valley, Kimberley region. MAIN OUTCOME MEASURES: Proportion of eligible women on the Register; age distribution of women screened; prevalence of squamous cell abnormalities. RESULTS: In December 1990, there were 507 Aboriginal women on the Register, being 86.9% of the Aboriginal women in the Fitzroy Valley aged 15-69 years. During 1990, 53.6% of the target population were screened; 369 Pap smears were taken from 312 Aboriginal women. Seventy-six (24.3%) had never previously been screened. Considering only the first smear for each woman in the study period, 10.6% showed minor abnormalities, and 1.6% (95% confidence interval [CI], 0.2%-3.0%) had cervical intraepithelial neoplasia (CIN I, II or III); 2.6% has smears showing definite evidence of human papillomavirus (HPV) infection. For 15-19 year olds the prevalence of CIN was 4.7% (95% CI, 1.0%-13.3%). CONCLUSIONS: The study shows how an inexpensive call and recall system can ensure good coverage of cervical screening in a group of women who would otherwise be under-screened. The overall prevalence of CIN in Aboriginal women in the Fitzroy Valley was lower than the figure for all Victorian women (3.6%--data from the Victorian Cytology Service). Although the numbers are small, the relatively high prevalence of CIN in young women is of some concern, and emphasises the importance of regular screening in this group.