In a newly published US study, Anaplasma phagocytophilum–human agent variant has been detected for the first time in the highly invasive Asian longhorned tick (Haemaphysalis longicornis). Active tick surveillance was conducted throughout Pennsylvania during the time period of May 1 through Sept. 6, 2019. Researchers tested 265 ticks for rickettsial pathogens through PCR testing and 1.5% of these ticks were positive for A. phagocytophilum. Two were confirmed positive as A. phagocytophilum–human agent variant through sequence analysis of the 16S rRNA gene.
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