What is the fine-grained topic of the following text: We conducted a molecular-diagnostic survey of the prevalence of N. bombi and trypanosomatids, such as Crithidia bombi, in six species of spring queens (n = 142) collected in 2011 and 2013 at three sites in central Kansas. Only return the topic.
Molecular-diagnostic survey of N. bombi and trypanosomatids prevalence in spring queens in central Kansas.