By means of a combination of the microscope with the camera, this picture depicts the course of this virulent fever. In Russia, which has at times been visited by terrible epidemics of recur... Read allBy means of a combination of the microscope with the camera, this picture depicts the course of this virulent fever. In Russia, which has at times been visited by terrible epidemics of recurrent fever, the disease is caused by the bite of a flea that carries the disease, while in... Read allBy means of a combination of the microscope with the camera, this picture depicts the course of this virulent fever. In Russia, which has at times been visited by terrible epidemics of recurrent fever, the disease is caused by the bite of a flea that carries the disease, while in Africa it is the tick found in that country that transmits the disease. The picture is il... Read all