Abstract

References
1.
Anderson
E S
. (1968 ) Brit. med. J.
iii , 333 .
2.British Medical Journal (1968 ) i , 263 .
3.British Medical Journal (1969 ) ii , 263 .
4.
Datta
N
. (1962 ) J. Hyg. (Camb.)
60 , 301 .
5.
Datta
N
. (1969a ) Brit. med. J.
ii , 407 .
6.
Datta
N
. (1969b ) Brit. med. J.
ii , 697 .
7.
Davies
J R
Farrant
W N
Tomlinson
A J H
. (1968a ) J. Hyg. (Camb.)
66 , 471 .
8.
Davies
J R
Farrant
W N
Tomlinson
A J H
. (1968b ) J. Hyg. (Comb.)
66 , 479 .
9.
Harada
K
Suzuki
M
Kameda
M
Mitsuhashi
S
. (1960 ) Jap. J. exp. Med.
30 , 289 .
10.
Lewis
M J
. (1968 ) Lancet
i , 1389 .
11.
Moorhouse
E C
. (1969 ) Brit. med. J.
ii , 405 .
12.
Salzman
T C
Klemm
L
. (1967 ) Antimicrob. Agents Chemother. (1966) p 212 .
13.
Taylor
J
. (1970 ) Proc. roy. Soc. Med.
63 , 1297 .
14.
Watanabe
T
. (1966 ) New Engl. J. Med.
275 , 888 .
