. Medical diagnosis for the student and practitioner. von Prowazek. Studieswere made later by Rocha-Lima, whonamed the organism rickettsia Commission to study typhus oper-ating under the Red Cross Societiesconducted a large amount of experi-mental work in 1920 which seems tohave definitely established this organismas the causal factor of the diseasealthough as yet it has been impossible to cultivate it. In smear preparations the organism is ovoid, occurs in pairs, filaments,or as bipolar staining rods. The organism is Gram-negative and can besatisfactorily demonstrated only with
. Medical diagnosis for the student and practitioner. von Prowazek. Studieswere made later by Rocha-Lima, whonamed the organism rickettsia Commission to study typhus oper-ating under the Red Cross Societiesconducted a large amount of experi-mental work in 1920 which seems tohave definitely established this organismas the causal factor of the diseasealthough as yet it has been impossible to cultivate it. In smear preparations the organism is ovoid, occurs in pairs, filaments,or as bipolar staining rods. The organism is Gram-negative and can besatisfactorily demonstrated only with the Romanowsky stains, of whichGiemsas modification is most satisfactorv. A Valuable Test.—Anderson and Goldburger have introduced a valuabletest for atypical cases. A guinea pig is injected with the blood of the suspectby the peritoneal route and will show the typical fever curve if typhus ispresent. Transmission.—Contrary to the belief formerly held up to the last fewyears, typhus fever is not readily, if at all, directly communicable from man. Fig. 507.—Clinical chart of typhusfever ending in recovery.—{From Wil-coxs Fever Nursing.) Probablecause. 10^2 MEDICAL DIAGNOSIS A banishedscourge. Easilypreventable. to man and practically all cases are now known to be dependent upon thebite of infected body lice. The conditions under which it develops make it extremely difficult toavoid epidemic spread, but it is now known that in hospitals those actuallyattending typhus cases seldom acquire the disease unless they become infectedwith body lice from outside sources. On the other hand, those employeesof the hospital who have to do with the reception and preparation of patientsat the hospital run a very considerable risk of acquiring the disease. Seasonal Occurrence.—The disease is distinctly seasonal as well asepidemic in type, being most prevalent during the later winter months,diminishing as the spring advances and reaching its minimum of incidenceduring the summer. Histor
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
