Publications by authors named "Xianfang C Liu"

Vaccination indicators are used to measure the health status of individuals or populations and to evaluate the effectiveness of vaccination programs or policies. Ensuring that vaccination indicators are clearly and consistently defined is important for effective communication of outcomes, accurate program evaluation, and comparison between different populations, times, and contexts. The purpose of this commentary is to describe commonly used vaccination indicators and to highlight inconsistencies in how childhood vaccine researchers use and define these terms.

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Background: We describe the epidemiology of pertussis in Alberta, Canada by person, place, and time between 2004 and 2015, identify outbreak years, and examine vaccination coverage and vaccination timeliness.

Methods: We used health data from Alberta's Communicable Disease Registry System for the period of January 1, 2004 through August 31, 2015 to identify unique cases of pertussis. Unique cases were deterministically linked to data in Alberta's immunization repository and health care insurance plan registry.

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Article Synopsis
  • A study in Alberta, Canada reviewed the adverse events following HPV vaccinations in females aged 9 and older, focusing specifically on concerns about venous thromboembolism (VTE) associated with the vaccine.
  • From 2006 to 2014, 195,270 females received 528,913 doses of the HPV vaccine, with 192 reporting adverse events, amounting to a rate of 37.4 AEFI events per 100,000 doses administered, and none were linked to VTE.
  • While 958 women were hospitalized and over 19,000 visited the emergency department within 42 days post-vaccination, only four cases of VTE were noted, with three linked to other risk factors,
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Background: In Canada both bivalent (bHPV) vaccine and quadrivalent HPV vaccine (qHPV) are authorized for use. In Alberta, while both vaccines are available for private purchase, only qHPV is publicly funded for school girls in grades 5 and 9 as of 2013. We describe HPV vaccine uptake in Alberta, by school year, from the start of the publicly funded program in the Fall of 2008 through to August 31(st) 2014 and estimate the cumulative proportion of the female population who were vaccinated by the end of the 2013/14 school year.

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Background: Excessive alcohol use in adolescence can be detrimental to health and academic performance. Few studies consider the moderating effects of parental and peer influence within the context of adolescent work outside of the school environment. This study aims to examine work stress among adolescents and the association with alcohol use and drunkenness, in the context of parental and peer influences.

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Background: Herpes zoster vaccine (HZV) is not publicly funded in the province of Alberta, Canada. We estimated vaccine coverage among those aged 60 years or older for 2013, as well as vaccine utilization rates per hundred thousand population over the period 2009 - 2013. We explored for factors associated with HZV dispensing rates.

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