In order to elucidate the typhoid and paratyphoid
B
phage type distributions in Japan, during the period of 1956-1965, a total of 1, 808 typhoid cases from 1, 002 foci and 114 paratyphoid
B
cases from
87
foci were submitted for phage typing of their infected organisms, and the following results were obtained.
1. The typhoid strains tested fell into at least 30 Vi-phage types. The sequence of frequency as counted by foci was as follows : types
D
2 (20%), M1 (13%),
E
1 (12%), A (7.
8
%), N+
D
1 (7.
4
%),
D
1 (2.
9
%),
D
6
(2.
8
%),
B
2 (2.7%), 39 (1.
5
%), H (1.1%), J1 and 46 (
0
.80%) ; C
5
, L1 and 41 (
0
.50%) ;
B
1,
B
3, C
4
,
D
4
,
D
10,
E
2,
E
4
,
E
9
, L2, T, 28, 29, 36, 38 and 47 (less than
0
.50%) . Distri-bution of typhoid Vi-phage types in Japan was characteristic of preponderance of types
D
2 and M1.
2. Of the foci studied,
5
.3% could not be assigned that their causative organisms belonged to any hitherto recognized Vi-phage type.
3. The prevalent typhoid Vi-phage types,
D
2, M1,
E
1, A and N+
D
1 were evenly encountered throughout the last ten years and distributed among almost throughout the country.
4
. Some of the rearly recognized typhoid Vi-phage types were indigenous to the relatively limited areas.
5
. Three new Vi-phage types, 39, 41 and 47 were identified.
6
. Paratyphoid
B
phage types encountered were as follows: Types 3a (49%), 1 (33%), 3
b
(
5
.7%), Dundee (2.3%), 3aI (1.1%) and Beccles (1.1%) . The remainders could not he assigned to any known type.
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