Journal
PATHOGENS
Volume 10, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/pathogens10091168
Keywords
Babesia microti; Babesia; diversity; phylogenetic analysis
Categories
Funding
- National Institutes of Health [R01 AI 130105, R01 AI 137424]
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Research has revealed a significant increase in the diversity of the Babesia microti species complex, with at least five distinct clades now identified. Existing knowledge about these parasites may need to be reevaluated, and future studies should pay careful attention to parasite identification and PCR primer specificity.
Parasites from diverse hosts morphologically identified as Babesia microti have previously been shown to belong to a paraphyletic species complex. With a growing number of reports of B. microti-like parasites from across the world, this paper seeks to report on the current knowledge of the diversity of this species complex. Phylogenetic analysis of 18S rDNA sequences obtained from GenBank shows that the diversity of the B. microti species complex has markedly increased and now encompasses at least five distinct clades. This cryptic diversity calls into question much of our current knowledge of the life cycle of these parasites, as many biological studies were conducted before DNA sequencing technology was available. In many cases, it is uncertain which B. microti-like parasite was studied because parasites from different clades may occur sympatrically and even share the same host. Progress can only be made if future studies are conducted with careful attention to parasite identification and PCR primer specificity.
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