Interviews with a selection of countries from each group will be conducted later to ascertain explanatory factors for increased or decreased distribution rates. The study’s results were compiled uniformly on a global basis from a standardized source. The vaccine producers that manufacture the majority of the world’s influenza vaccines (IFPMA IVS members)
accounted for approximately 79% of the global seasonal influenza vaccine production reported by a 2011 WHO survey , or 489 million doses out of 620 million doses, with the remainder manufactured by non-IFPMA IVS members. However, some limitations to the survey methods must be noted. Some error may have occurred due to inaccurate reporting by distributors, but this error should be small. It is also recognized that dose distribution is not synonymous with vaccination coverage rates, but provides a reasonable proxy to assess vaccine utilization. Also, increases in absolute selleck numbers of doses distributed
may in some cases reflect changes in PCI-32765 solubility dmso target populations (i.e., new target groups), and not increased coverage. Global distribution of IFPMA IVS seasonal influenza vaccine doses in 2011 represents an approximate 87% increase over absolute number of doses distributed in 2004 (489.1 versus 261.7 million doses) as seen in Fig. 1, but only an approximate 12% increase over doses distributed in 2008 (489.1 versus 436.5 million doses). Thus, while there is a positive trend in global distribution of doses, and a majority of countries (56%) have increased doses distributed per 1000 population between 2008 and 2011, the rate of growth has slowed
considerably. In 2011, only 24% of 115 countries had achieved or surpassed the hurdle rate of 159 doses per 1000 population. Using vaccine dose distribution as a proxy for vaccine coverage would therefore suggests that the majority of countries have not achieved inhibitors national or supranational targets for influenza vaccination where they exist. Low coverage rates cannot be attributed to lack of vaccine supply as global manufacturing capacity for influenza vaccines has grown steadily but remains underutilized with only about half the capacity being consumed annually . Hence, many vulnerable patients are not protected against most the potential serious implications of an influenza infection. Furthermore, there are significant regional disparities in dose distribution. Increases in distributed doses have been predominantly steady in all WHO regions since 2004, except in EURO and EMRO where distributed doses have been declining since 2009. AFRO, SEARO and EMRO constitute 47% of the global population but account for only 14.1 million doses of the more than 489 million IFPMA IVS doses (3.7%) distributed in 2011. And within these 3 regions, further inequities in distribution exist with only 4 countries having distributions of >70 doses per 1000 population and the vast majority of countries having considerably lower per capita distributions.