The article explores Swedish consular secretary Jakob Gråberg in connection to the plague epidemic in Morocco, focusing on the summer of 1819. Gråberg described a treatment based on the liberal use of olive oil and a method of inoculation, both of which he claimed to be highly effective. In addition, he drew conclusions about the mechanisms by which the illness enters the body and causes the outbreak of plague. These reports and deductions—the contents of which were widely circulated by Gråberg's scientific peers—represent early, tentative developments in epidemiology.
