1. period ranging for four days to many months 2. rigors, myalgia and general malaise. 3. becomes carries of the virus. 4. infectious during the catarrhal stage. 5. disease of childhood 6. of AIDS. 7. of B. burgdorferi from animal to man by ixodid tick 8. with peaks of temperature of 39.5 Degrees Celsius. 9. pyrexia of unknown origin. 10. measles, mumps, and rubella(MMR) vaccine.