In autumn 1959, a small outbreak of scrub typhus occurred among infantrymen of the Ground Self-Defense Force at the Fuji School located at the foot of the Mt. Fuji.
All the 7 cases reported manifested typical clinical features of scrub typhus with the exception of one subclinical case.
They seemed to have been infected through the bite of infected mite with R. orientalis when they worked on the maneuvering ground at the foot of Mt. Fuji.
On investigation of the maneuveung ground, contaminated spot was found to be limited.
Crombicula scutellaris has been suspected so far as the vector. “Fuji Fever” was proposed by the authors to the disease as one of the localized scrub typhus in Japan.

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Seven cases of scrub typhus which occurred among infantrymen of the Ground Self- Defense Force at the Fuji School were investigated etiologicolly as well as serologically.
All cases showed positive Weil-Felix reaction against OXK and positive complement fi xation test (CFT) against Karp antigen.
Thus they were diagnosed as scrub typrus not only clinically but also serologically. In general, the production of CF antibody in sera of patients was delayed 4-5 days compared with OXK antibody.
The rickettsia was isolated not only from blood of 4 cases but from regional lymph nodes of 2 cases. One of the new isolates, Uemura strain, was identified as R. orientalis by cross challenge test in mice.
Attempts were made to and cases, which escaped physicians' attention, by immunoepidemiological survey with sera collected from infantrymen of the school.
i) A limited number of blood specimens from the 3rd year and 2nd year classes and recruits, who entered the school after the epidemic was over, were examined by CFT. Some individuals with positive reaction were found among the 3rd and 2nd year subgroups with history of minor illness, but none among the healthy subgroups.
ii) Three months after the epidemic was over, blood specimens were examined from about 150 infantrymen treated at the dispensary as having had common cold during the scrub typhus epidemic from October to November, 1959. Ten specimens were found positive.
From the foregoing, it is clear, that scrub typhus in this aerea may not always show the typical symptoms, but sometimes remain very mild and be diagnosed simply as common cold.

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The normal value of antistreptolysin o was investigated by means of the Rantz's method with convalescent sera of 257 cases (129 males and 128 females), from 2 to 84 years old, admitted to the Ebara Hospital as bacillary dysentery from January 1956 to January 1957.
The results were as follows Under 50 units 163 cases (63%) 100-125 units 75 cases (29%) Under 166 units 250 cases (96%)
As a whole, the limit of normal value was found to be under 166 units. As for the age influence, cases aged 5 to 19, demonstrated higher values, mostly12-166 units, as compared with other age groups, whereas 21 cases of 24 infants aged 2 to 4 and 21 cases of 23 old persons aged over 60 showed values under 50 units, a definitel low tendency, with the implication, that the consideration of age is necessary for the evaluation of normal values.
The sex and the season appeared in this series of investigations to have no influence on the fluctuation of the values, when the age influence was taken into condideration.

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