Experiment: Brown Dog Ticks Preferred Humans To Dogs By Margin Of 2.5 Times As Temperatures Rose
Confining a young researcher in one box and a dog in another and unleashing blood-sucking ticks to scamper between the boxes sounds like a stunt from I’m A Celebrity. But the stomach-churning scientific experiment has revealed that ticks carrying the deadly Rocky Mountain spotted fever (RMSF) disease are more than twice as likely to shift their feeding preference from dogs to humans when temperatures rise.
The study, presented at the annual meeting of the American Society of Tropical Medicine and Hygiene (ASTMH), observed whether the ticks, which use smell to seek out a host upon whose blood to feed, scuttled along a plastic tube towards the dog or the human. When the temperature in the laboratory was raised from 23.3C to 37.8C, one type of “brown dog” tick, known as the tropical lineage tick, was particularly prone to shifting its preference from the box containing the dog to the box containing the person.
“Our work indicates that when the weather gets hot, we should be much more vigilant for infections of RMSF in humans,” said Laura Backus, who led the study at the University of California, Davis School of Veterinary Medicine. “We found that when temperatures rose from about 74F (23.3C) to 100F (37.8C), brown dog ticks that carry the disease were 2.5 times more likely to prefer humans over dogs.” There is growing concern over the increase in tick-borne diseases. Cases of Lyme disease, a potentially debilitating condition primarily transmitted by black-legged ticks, have doubled over the past two decades to about 30,000 cases a year in the US.
Cases of RMSF and other related diseases, known as spotted fever rickettsiosis, have risen dramatically over the last two decades. The disease is treatable with antibiotics if detected in the first week of infection but, if left untreated, the fatality rate can exceed one in five. Tropical lineage brown dog ticks are currently found across southern US states such as Arizona, Florida and southern California. Their range is expected to move northward as climate change causes average temperatures to rise.
EDIT
https://www.theguardian.com/science/2020/nov/16/study-finds-ticks-choose-humans-over-dogs-when-temperature-rises
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