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However, while reducing vaccine-serotype disease, an important secondary effect of the PCV7 vaccination programme was found to be that of replacement disease caused by non-vaccine serotypes. In the UK, a significant rise in the incidence of IPD caused by serotypes 7F, 19A and 22F has been reported [25]. In the USA, an increase in disease caused by antibiotic-resistant serotype 19A was reported [24, 39]. In a review of data on serotype replacement in disease after PCV7 vaccination it was reported that although in most populations there has been an increase in non-VST-IPD, in most cases this increase has been less than the reduction in VST-IPD, so resulting in a net reduction in all-type IPD [51]. The authors suggest that the serotype replacement in nasopharyngeal carriage does not lead [http://www.selleckchem.com/products/tariquidar.html Tariquidar in vivo] to a comparable serotype replacement in disease because of the lower invasiveness of the replacing serotypes in the nasopharynx. In comparing the incidence [http://www.selleckchem.com/autophagy.html Autophagy inhibitor] of IPD in the pre-vaccination and post-vaccination periods, disease surveillance systems must consistently note the source of clinical isolates (i.e. proportion of IPD from blood cultures of febrile children), be aware of changes in the frequency of IPD detection and reporting over time (i.e. active compared with passive reporting systems) and natural fluctuations in serotype-specific IPD incidence, obtain a sufficiently long period of follow-up, and follow the presence of immunodeficiencies and other co-morbidities with the clinical isolate. Furthermore, measured impact can depend upon vaccine uptake, include the rate of uptake and regional differences in vaccine uptake, as well as patterns of antibiotic use [51]. PCV13 has been introduced into national immunization programmes since 2010, and surveillance demonstrates that this vaccine has an additional impact, targeting the serotypes [http://en.wikipedia.org/wiki/PRDX5 PRDX5] unique to PCV13, as well as continuing to protect against the PCV7 serotypes. In the UK, PCV13 was introduced nationwide in transition from PCV7 (i.e. as the next vaccine for any dose in the paediatric pneumococcal conjugate vaccination schedule); however, there was no catch-up vaccination programme for older children who were already fully vaccinated with PCV7. The first published data from the UK, covering the transition period between the two vaccines, showed that among the 166 IPD cases in PCV13-eligible children reported by July 2011, the vaccine effectiveness was 78% (95% CI ?18�C96) for two doses administered to children aged