I have a feeling you can only descriptively describe these data, otherwise you may run into ecological fallacies, trying to correlate different types of data. The common example may be we increased the speed limit and saw more vehicle deaths. However, we don't know if the deaths were related to speeding. Your issue would be, I have human and animal data, both collected in different ways. Since they are collected in different ways, can we compare them. Probably not. Plus you say there are 13 strains, but that is based on capture animals or random sampling, etc. You don't know how many there really are and if the process to find them in one species is better than another species, the process may limit your knowledge and the veracity of conclusions.