Vaccine
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Pertussis is an acute infectious illness, caused by the bacteria Bordetella pertussis and commonly known as "whooping cough". Waning immunity after vaccination or after natural infection contributes significantly to the increasing incidence rates in adolescents and adults. Prevention of pertussis in industrialized countries is mainly based on immunization with acellular vaccines in combination with other antigens. A booster dose with an adult-formulation tetanus-diphtheria toxoid and acellular pertussis vaccine (Tdap) is now recommended for all adolescents by several countries, and replacement of the decennial Td dose with a single or more doses of Tdap is recommended for adults. ⋯ Despite the more recent position paper of WHO gives priority to infant and childhood vaccination against pertussis and leaves adolescent, adult and risk group immunization as an option for the future, data are quickly accumulating to support the need to consider pertussis vaccination as a crucial preventative intervention even in adolescents and special risk groups.
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Randomized Controlled Trial
The effect of an alternative reduced-dose infant schedule and a second year catch-up schedule with 7-valent pneumococcal conjugate vaccine on pneumococcal carriage: a randomized controlled trial.
The 7-valent pneumococcal conjugate vaccine (PCV7) was initially licensed for use as 3 infant doses and a booster (3+1). However, 2 infant doses plus a booster schedules only (2+1) are widely used. We compared the effect of these two schedules on pneumococcal carriage in young children. We also assessed the effect of a 2-dose schedule in the second year ("catch-up" schedule; 0+2). ⋯ Three infant doses seem to better protect against PCV7-serotype acquisition and carriage than two. However, after booster, most of these differences disappear. A 2-dose second year catch-up campaign may enhance the reduction of PCV7-serotype spread in the community.
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Mumps is easily preventable through vaccination. Investigation of a number of recent mumps outbreaks in universities in the North West of England, however, found that affected students were either not vaccinated or only partially vaccinated. An online survey of students (n=2456) attending five universities in the region was undertaken during 2010 to establish MMR vaccination status, knowledge of mumps and willingness to take up vaccination if offered. ⋯ Those least likely to take up vaccination included students not registered with a GP; mature students; and those who did not consider mumps to be a serious disease. The survey also highlighted that misconceptions remain about both the MMR vaccine safety and perceptions of risk/benefit of the vaccine. Encouraging registration with a GP and awareness raising should be a key part of campaigns to improve vaccination uptake among university students.
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Randomized Controlled Trial
Assessment of the immunogenicity and safety of varying doses of an MF59®-adjuvanted cell culture-derived A/H1N1 pandemic influenza vaccine in Japanese paediatric, adult and elderly subjects.
Effective vaccination strategies are required to combat future influenza pandemics. Here we report the results of three independent clinical trials performed in Japan to assess the immunogenicity, tolerability and safety of varying doses of a cell culture-derived MF59(®)-adjuvanted A/H1N1 pandemic vaccine in healthy Japanese paediatric, adult and elderly subjects. ⋯ The use of MF59 adjuvant allows for much reduced vaccine antigen content, and a single dose administration schedule in adults and the elderly. The production of pandemic vaccine using modern cell culture techniques is highly advantageous in terms of the quantity, quality, and rapidity of antigen production; these benefits, in combination with the use of MF59, maximize manufacturing capacity and global vaccine supply. These data support the suitability of the investigational vaccine for use in the Japanese paediatric, adult, and elderly populations.
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Hemodialysis patients have higher risk of mortality and morbidity when infected with 2009 pandemic H1N1 (pH1N1/09) virus. Depending on different methodologies and criteria, previous studies reported variable response rates to adjuvanted vaccines against pH1N1/09 virus in hemodialysis patients, however, the efficacy of non-adjuvanted vaccines, which are currently used in many countries such as the USA and Asian areas, has not been comprehensively evaluated in hemodialysis population before. ⋯ According to the European and U.S. criteria, a single 15 μg-dose of non-adjuvanted pH1N1/09 vaccination is safe but ineffective in both adult and elder hemodialysis patients. Further studies using multiple doses or higher antigen amount are warrant to define the most appropriate regimen.