8

REPORT OF THE KING INSTITUTE, GUINDY

our process of an extra bovine passage will eliminate the possible danger without
loss of potency of the lymph, which is what occurs if rabbit passage be neglected.

    (6) Off season.—As in previous years routine vaccination was suspended in
all the districts for four months during the hot weather. No changes were made
in the periods of suspension in different districts.

    (7) Quantity of lymph issued.—The total number of doses issued this year
was 2,368,000 which is a record supply for the Presidency and exceeds the
previous year's supply by 109,774 doses. It will be seen from Table II
which gives a list of the recipients, that the increase is mainly due to the larger
supplies made to municipalities and district boards and also to "other bodies."

    (8) Amount of lymph unaccounted for.—Full details are given in Table III
As in previous years lymph issued to "other bodies" is not taken into considera-
tion, and only the returns received up to 1st June are considered. The percent-
age of unaccounted lymph is 6.9 this year as against 12.2 per cent last year—a
return to normal.

    The following districts show percentages over 10:—

    (9) Type of vaccination.—These are set out in the following table:—

    (10) Primary vaccination.—The case-success rate this year is 96.7 per cent
as against 97.4 per cent last year and 96.9 the year previous. The insertion-
success rates are 88.0 per cent this year as against 89.7 last year and 89.2 the
year previous. While slight variations in case and insertion-success rates are
only to be expected, particularly in a year such as this with a record number of
vaccinations, the slight lowering of case-success this year is mainly due to
poor results obtained in October in a large number of cases for some unexplained
reason. This can be seen from Table IV giving the monthly vaccination rates.
The rates for other months are very satisfactory and it is to be particularly
noted that they are normal from December to March—the period covering the
issue of lymph diluted 1 in 7.

    The district rates are given in Table V, the districts being arranged
according to their case-success rates. Only three districts have obtained a case-
success rate of 99 per cent, viz.—