Detection of Babesia microti by polymerase chain reaction

Abstract

Human babesiosis, which is caused by infection with the intraerythrocytic malarialike protozoan Babesia microti, has recently been diagnosed with increasing frequency in residents of New England. Diagnosis is difficult because of the small size of the parasite and the sparse parasitemia that is characteristic of most infections with this pathogen. We generated B. microti-specific DNA sequence information by universal primer amplification of a portion of the eukaryotic 16S-like gene; this was followed by direct DNA sequence analysis. Specific primers were synthesized on the basis of this sequence information for use in the polymerase chain reaction (PCR). The PCR-based system demonstrates a strong bias for detection of B. microti as opposed to Babesia gibsoni and does not amplify vertebrate DNA. The analytical sensitivity of the system is approximately three merozoites. Blood specimens from 12 patients with clinically diagnosed and parasitologically confirmed babesiosis from Nantucket Island, Mass., were PCR positive in a blinded test of this procedure. Thus, DNA amplification may provide an adjunct to conventional methods for the diagnosis of human babesiosis and may provide a new means of monitoring therapy or enhancing epidemiological surveillance for this emerging pathogen.

A Molecular Survey ofAnaplasmaspp.,Rickettsiaspp.,Ehrlichia canisandBabesia microtiin Foxes and Fleas from Sicily

“…(Stuen et al, 2003), Rickettsia spp. (Tzianabos et al, 1989), E. canis (Siarkou et al, 2007) and B. microti (Persing et al, 1992). PCRs were performed using GoTaq Polymerase (Promega, Madison, WI, USA).…”

Efficacy of Combined Atovaquone and Azithromycin for Therapy of Chronic Babesia gibsoni (Asian Genotype) Infections in Dogs

“…20 The other genotype has been reported only in dogs in California. The genotype of the majority of small Ba-From the Departments of Clinical Sciences (Birkenheuer, Breitschwerdt) 18,22,23 The number of B gibsoni (Asian genotype) infections reported in the United States is increasing. Prior to 1999 there were only 2 cases of presumed B gibsoni (Asian genotype) infections in the United States, and 1 of those was in a dog that had been imported from a region where the disease is endemic.…”

Development of a real‐time polymerase chain reaction assay for sensitive detection and quantitation of Babesia microti infection

“…Importantly, there is low homology between B. microti-specific sequences targeted by these primers, and ss-rDNA sequences from rats and humans, as well as Plasmodium species and other intraerythrocytic pathogens. 5…”