will have to look into when the dry season is in china.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5467638/
Specimen type was highly associated with CoV positivity, and samples containing feces or fecal swabs were significantly more likely to test positive than other specimen types in all regions. Bat family was important in Asia and Africa. Season was also significant, with samples collected during the dry season more likely to test positive in Africa and Asia than those collected during the wet season (albeit with low odds ratios).
Based on our study, we were able to estimate the sampling effort that would be required to find all CoVs in bats, based on a Poisson regression model of our data (Fig. 6). With 154 individuals, we estimate that an average of one CoV will be detected (95% CI 136–177). With 397 individuals, we estimate that up to five CoVs will be detected (95% CI 351–458). As we did not observe any species with greater than five viral sequence clusters, we make the assumption that sampling 397 individuals should capture the full diversity of CoVs in each bat species.
In total, we estimated that there are at least 3,204 CoVs (based on the cluster definition used in this study) in bats. This suggests that although there is still a large number of coronaviruses that remain to be discovered, their detection remains an achievable goal, and we advocate for their discovery given the potential for even greater insights into the global ecology and evolution of these viruses (e.g. further investigation into regional differences in host switching), and the opportunity to elucidate their individual zoonotic potential (Ge et al. 2013; Wang et al. 2014; Yang et al. 2014; Anthony et al. 2017).