| 1 | Relapsing fever is an acute febrile illness caused by spirochetes of the genus Borrelia. | |
| 2 | Leptospirosis causes severe jaundice, kidney failure and bleeding in the lungs. | |
| 3 | Scientists have yet to discover what caused the strange spiral structure. | |
| 4 | But as the cylinder gets wider, the possibilities spiral into mind-bogglingly complex helices and patterns. | |
| 5 | In some areas, tick-testing services for the presence of Lyme disease spirochetes may be available from a government or commercial laboratory. |