Temperature, forest cover and cattle predict the risk of being infected with Mansonella perstans in Uganda... Also, this species of parasite has a geographical range that very distinct from another filarial worm, Wuchereria bancrofti, in Uganda. Yet, where they do overlap, there is a positive association between the two species.. I find that quite intriguing.

Read more:
Stensgaard et al., 2016 - PloSNTD
​https://www.eurekalert.org/pub_releases/2016-01/p-apr012016.php

Here is some from press release..

Snail fever expected to decline in Africa due to climate change
RESEARCH The dangerous parasite Schistosoma mansoni that causes snail fever in humans could become significantly less common in the future a new international study led by researchers from the University of Copenhagen predicts. The results are surprising because they contradict the general assumption that climate change leads to greater geographical spread of diseases. The explanation is that the parasite’s host snails stand to lose suitable habitat due to climate change.

news.ku.dk/all_news/2013/2013.12/snail-fever-expected-to-decline-in-africa-due-to-climate-change
www.sciencenewsline.com/news/2013121312090012.html