Volume s1-1, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Two white rats have been infected with relapsing fever by inoculating them with a suspension of macerated naturally infected ticks, .

Typical spirochaetes have been found in naturally infected ticks in Panama.

One monkey, , has been infected with the relapsing fever of Panama by feeding a number of larvae () upon an infected white rat and twenty-two days later allowing the same ticks as first stage nymphs to feed on the monkey.

Three human beings, volunteer patients, have been infected with relapsing fever as follows:

  • 1.  The first by a subcutaneous injection of blood from a white rat which had been infected with relapsing fever by a combined subcutaneous and intraperitoneal injection of naturally infected ticks.
  • 2.  The second by a hypodermatic injection of a suspension of naturally infected ticks.
  • 3.  The third by being bitten by naturally infected ticks.

Tabulations of the results obtained by inoculating white rats, white mice and monkeys, , with the spirochaetes of the relapsing fever in Panama are presented. Also a brief allusion is made to their measurements and appearance in cultures.


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  • Received : 14 Jun 1921
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