The random null model was of equal proportions of positive, neutral and negative effects, while the no-effect null model was that coinfecting pathogens do not interact,
allowing for a 5% error rate (hence 2.5% negative, 2.5% positive, and 95% neutral reported effects). MS-275 molecular weight This constitutes a recommended vote-counting method deriving continuous parameters analysed against confidence intervals (α = 0.05). 27 Finally, we explored the potential influence of the missing data (NAs) on the effects of coinfection in the analysis (56 for pathogen abundance, 79 for host health). These values represent reported coinfections where the effect on either pathogen abundance or host health was not reported, despite the possibility that these coinfecting pathogens did interact with each
Erlotinib supplier other and/or influence host health. We therefore assessed how potential interactions from these unreported effects may alter the overall patterns of coinfection effects. To determine their potential impact on the estimated overall effects, NAs were assigned one of three values at random (+1, 0, −1). The mean effect was then calculated per publication or coinfection pair as before, and a grand mean taken across all publications or coinfection-pairs. The grand mean represents an estimate of overall effect of coinfection on either host health or pathogen abundance across either publications or coinfections, given a particular random assignment of −1, 0, +1 to NAs. Repeating this random assignment 1000 times produced a distribution of grand means. We examined whether recent coinfection research focuses on the pathogens causing the highest global mortality. We obtained global totals for the number of deaths (both sexes, all ages) in 2009 under every category of infection collated by the World Health Organisation
(obtained from the Global Burden of Disease section of the Global Health Observatory website).28 We compared the ten categories causing most global deaths in 2009 with total reports of coinfection involving these infections. Comparing the top ten infection categories by mortality with their morbidity measures (DALYs) yielded Methocarbamol similar trends, so we present only data from the mortality comparison. Hundreds of publications on coinfection are published annually and have increased from 219 publications in the first year of search results to 1464 publications in 2009 (Fig. 1). This increase includes studies of both human and non-human hosts. Of the 1464 publications retrieved for 2009, 309 reported multiple pathogen species coinfecting humans. Publications came from 192 journals, with most (136 of 192 journals, 70.8%) publishing a single coinfection article in 2009. The majority of relevant publications from 2009 were observational studies (234 of 309, 75.0%), of which 159 (67.9%) involved patient groups, 60 (25.6%) were case notes and 18 (7.7%) surveyed a population. Three observational studies (1.