Lyme-related bacteria discovered in three B.C. ticks

Three ticks collected in British Columbia since June have tested positive for a new species of bacteria.

The B.C. Centre for Disease Control and Public Health Agency of Canada confirm three ticks collected in British Columbia since June have tested positive for a new species of bacteria closely related to Borrelia mayonii (B .mayonii)

“This is a rare discovery which highlights that our tick surveillance program is working at both a local and national level,”said Dr. Eleni Galanis, physician epidemiologist with the BCCDC.

“While further investigation is warranted, the health threat posed by this new species of bacteria is extremely low.” Borrelia mayonii is a newly-discovered species of bacteria that can cause Lyme disease in people.

Until now, it had only been confirmed in the midwestern United States.

According to the Centers for Disease Control and Prevention in the United States, six of approximately 9,000 diagnostic samples from residents of Minnesota, Wisconsin, and North Dakota revealed the presence of B. mayonii.

The species of bacteria discovered in the three B.C. tick samples is slightly different than that in the United States, and thereis no evidence that anyone in BC has developed Lyme disease from this B. mayonii-like bacteria.

The first infected tick was removed from a dog in June 2016 that had been camping with its owner in the Lower Mainland.

While the tick was positive for the new bacteria, the dog remains well and has no signs or symptoms of Lyme disease.

The second infected tick was removed from a child in July.

The child is believed to have been bitten in the central interior of B.C.

The child also remains well and has had no signs or symptoms of Lyme disease.

The third infected tick was removed from a dog in the Lower Mainland in September.

This dog also has no signs or symptoms of Lyme disease.

The BCCDC and PHAC are studying the clinical implications of this discovery, and follow up has occurred with the petowners and the family of the child involved.

“When the first tick with this B. mayonii-like bacteria was confirmed by PHAC’s National Microbiology Laboratory, theBCCDC Public Health Laboratory retested all tick samples that had inconclusive results over the last several years,” said Dr.Muhammad Morshed, clinical microbiologist with the BCCDC. “Of more than 19,000 ticks tested by PHAC, and nearly 2,800more at the BCCDC, these are the only three that have been found with this B. mayonii-like bacteria.”

In BC, less than 1 per cent of ticks tested carry bacteria that can cause Lyme disease, and the prevalence of Lyme-causing bacteria in B.C. ticks has remained consistently low.


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