Development of a duplex real-time PCR assay for the differentiation of Blastomyces dermatitidis and B. gilchristii and a retrospective study of blastomycosis in New York (2005-2019)
2020
Blastomycosis due to Blastomyces dermatitidis and B. gilchristii is a notable cause of respiratory mycoses in North America with recurrent outbreaks. We developed a highly sensitive, specific, and reproducible Taqman duplex real-time PCR assay for the differentiation of B. dermatitidis and B. gilchristii. The new assay permitted retrospective analysis of Blastomyces cultures (2005 to 2019), and primary clinical specimens (2013-2019) from NY patients. Blastomyces dermatitidis was the causal agent for the majority of 38 cases while B. gilchristii was implicated in five cases; a rare finding reported from New York. The duplex real-time PCR assay will be useful for further understanding of ecology and epidemiology of blastomycosis caused by B. dermatitidis and B. gilchristii.
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