<prompt> A lady presented with fever and rashes, she returned from the USA gives a history of exposure to ticks. Most probable diagnosis isEpidemic typhusScrub typhusRocky mountain feverOraya fever  <response>: Rocky mountain spotted fever caused by R.ricketsii is most serious type of spotted fever.it is prevalent in n.america and South America,transmitted by dermacabtor Andersoni and related sps of ticks Anantnarayan and panikers 10th edition 