For an equilibrium group size of 8, the mean prevalence was 19% at an external infection probability of 0.01, compared with between 2% and 4% for lower external infection probabilities of 0.001 and 0.0001.
Starting from a mean prevalence of 23.2% at round 1, prevalence decreased to 10.9% at round 2, and 8.5% at round 3, representing a relative decrease of 60.5% in intervention areas over the course of the dry season in 2012.
Using 17,622 cow observations, the mean prevalence of subclinical mastitis at the cow level was 37.2%95%5% confidence interval: 31.2, 43.3) for the first month and did not substantially change throughout the study.
We estimated the mean prevalence of the outbreaks at 17.19% (Technical Appendix Figure 1, panels A, B).
At an equilibrium group size of 8 individuals, the disease persisted in all simulation runs at a mean prevalence of 5%, and for an equilibrium group size of 12, the mean prevalence was 36%.
There are 10.1 million people in the British Isles who suffer from asthma with a mean prevalence of clinical asthma estimated at 16.1%, which is among the highest rates of asthma in the world (Masoli et al. 2004).
Although such diseases do have a seasonal component to their incidence they nevertheless exist at some stable mean prevalence within the host population.
The mean prevalence of infection in adult ticks at all the other sites where we found I. scapularis was therefore 7.7% (8 of 104).
Previous work by our group has demonstrated a 33%% mean prevalence of diarrhoea in nursery pigs at the time point when stock personnel initiated batch medication and the decision to treat is typically done by stock personnel based on assessment of diarrhoea prevalence and diarrhoeic faecal pools on the pen floor [ 12].
Slopes were fitted to each resampled mean prevalence pair (ACT and ACT + PQ) at constant coverage level, allowing calculation of mean relative prevalence reduction upon addition of PQ at every coverage level for each ACT.
