NCIt definition : A bacterial infection caused by Rickettsia typhi or Rickettsia felis. It is transmitted
to humans from infected rat fleas. Symptoms include fever, headache, joint and muscle
pain, and weakness.;
Alternative definition : NICHD: An infection that is caused by Rickettsia typhi or Rickettsia felis, which
is transmitted to humans from infected rat fleas; symptoms include fever, headache,
joint and muscle pain, and weakness.;