A lady presented with fever and rashes, she returned from the USA gives a history of exposure to ticks. Most probable diagnosis is
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 paniker's 10th edition
Epidemic typhus
Scrub typhus
Rocky mountain fever
Oraya fever
Bacteriology