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SYNOPTICAL TABLE OF VARIOUS STRAINS OF SPIROCHÆTE AND CLINICAL SYMPTOMS OF THE
RELAPSING FEVERS THEY EVOKE IN MAN

(Compiled mainly from Mackie, Chosky and Balfour)

	Egypt Spirochæta berbera	Algiers Spirochæta berbera (?)	Europe Spirochæta recurrentis (obermeieri)	Africa Spirochæta duttoni	America Spirochæta novyi	India Spirochæta carteri
Minimal length	13.5 $\mu$.	12 $\mu$.	12 $\mu$.	13 $\mu$.	7-9 $\mu$.	12 $\mu$.
Shape	Irregular open flexures.	Irregular open flexures.	Spiral.	Open flexures.	Regularly spiral.	Open flexures.
Flagella	?	?	Peritrichous.	Peritrichous.	Terminal (Novy.)	?
Animals Susceptible.	Gerbils, slightly. Monkeys (Cercopithecus).	Rats and mice, with difficulty. Monkeys (Macacus).	Small rodents, only after passage through monkeys.	Small rodents and many animals susceptible.	Small rodents very susceptible.	Small rodents infected with difficulty.
Course in animals.	Very mild.	As a rule mild.	Mild.	Very severe.	Severe.	Very mild.
Subinoculations in animals.	Gerbil to gerbil, positive.	Rat to rat, or mouse to mouse, with difficulty.	Monkey to monkey, mouse to mouse, positive. (Fülleborn and Meyer.)	Monkey to monkey, positive. Same for most animals. (Breinl, Kinghorn & Garrett.)	Monkey to monkey and mouse to mouse, positive.	Monkey to monkey and mouse to mouse, positive. (Mackie.)
Course in man.	Fairly severe. First attack 2-8 days; two or three relapses.	Fairly severe. First attack 2-8 days; two or three relapses.	One, sometimes two relapses. Incubation period 5-7 days. Duration of attack 5-6 Apyrexia 7-10	Severe—four or five relapses. Incubation period 7-10 days. Duration of 1st attack 3 Apyrexia 1-8	Mild, rarely more than one relapse. Incubation period 5-7 days. Duration, 1st attack 5-6 Apyrexia 7-10	Severe, one or two relapses. Incubation period 7 days. Duration, 1st attack 5-7 Apyrexia 5-13
Parasites in human blood.	Variable.	Variable.	Heavy infection.
Natural transmitters.	Lice.	Lice Ticks (Argas persiscus). (Sergent.)	Lice. (?) Bed bug (Acanthia lectularia).	Ticks (Ornithodoros moubata).	Lice (?) Ticks (Ornithodoros talaje) (?).	Lice (?)Bug (Cimex rotundatus).
Serum reactions	?	Immune serum possibly without effect on S. recurrentis (obermeieri).	Immune serum without any effect on S. novyi or duttoni.	Immune serum without any effect on S. novyi or recurrentis (obermeieri).	Immune serum without any effect on S. recurrentis (obermeieri), duttoni, or carteri.	Immune serum without any effect on S. novyi.