3
1922-23 against 244,217 and 618,351 during the two preceding years. The
average number of operations of the triennial period under review was 358,787
against 290,917 during the previous epoch.
7. Six-puncture vaccination.—The total number of successful primary
and re-vaccinations performed in sis points during the year amounted to
172,833 and 6,254 respectively against 168,976 and 7,729 during the previous
year. The average of the triennial period was 182,297 and 19,952 against
187,796 and 9,739 during the previous epoch.
8. Factory and tea garden vaccination.—The total number of primary
and re-vaccinations performed in factories and tea gardens in this Presidency
during 1922-23 was 5,479 and 2,261 against 4,333 and 6,448 respectively during
1921-22 and 6,485 and 4,976 during 1920-21. It is reported that the managers
of many factories and tea gardens do not send the vaccination returns to the
Superintendents of Vaccination of the municipalities and District Boards in
which these are situated. Their attention is being drawn to it. The average
of the triennial period was 5,432 primary and 4,562 re-vaccination cases against
6,193 and 11,056 respectively during the previous triennium.
9. Cost of and contribution towards vaccination.—The total average cost
of vaccination during the triennial period under review was Rs. 3,59,906-9-6
against Rs. 2,47,585-0-11 during the previous epoch, the cost of each
successful case of vaccination being three annas and four pies against two
annas and two pies during the previous triennium. Out of the average cost
mentioned above Rs. 97,749-12 was contributed by the District Boards and
Rs. 262-13-3 by cantonments against Rs. 35,170-4 and Rs. 115-1-4 respectively
during the previous triennium. The introduction of paid vaccination system
in rural areas is responsible for the increased cost. The local Government
contributed a sum of Rs. 25,000 during the year 1922-23 to the District
Boards for the promotion of free vaccination.
10. Diagram illustrating death-rates from small-pox and the degree
of protection afforded, during the years from 1913-14 to 1922-23.—The
death-rates from small-pox in each district and the proportion of population
protected against the disease by vaccination during the past ten years are
shown side by side in the diagram facing this page.
11. Deaths from small-pox.—The total number of deaths recorded from
small-pox in this Presidency during the year 1922-23 was 7,468 against 6,380
and 21,950 during the two preceding years, the ratio per mille of population
being .16 against .14 and .48. The largest number of deaths was recorded
in the districts of Jalpaiguri (1,279), Mymensingh (1,090), Dacca (912),
Midnapur (881), Chittagong (868), Calcutta (322), 24-Parganas (317),
Rangpur (250), Howrah (248), Murshidabad (212), Noakhali (143), Tippera
(124), Burdwan (105), Dinajpur (96), Hooghly (95), Malda (95), Nadia (88),
Jessore (73), Rajshahi (65), Birbhum (60) and Bankura (54), while the other
districts recorded 3 to 50 deaths. There was no death from this disease in
the district of Darjeeling.
12. Bengal Vaccine Depot.—The total number of calves vaccinated in
the Bengal Vaccine Depôt during the year 1922-23 was 2,726 against 2,456
and 2,278 during the two preceding years and the quantity of lymph manu-
factured was 1,706,089 grains against 1,490,222 and 1,506,164 grains,
respectively, during the two previous years. The average of the triennial
period was 2,486 calves and 1,567,825 grains of lymph against 2,498 calves
and 1,210,711 grains of lymph during the previous triennium.
13. Different methods of vaccination.—During the year 1922-23, no
vaccination was performed with lymph direct from the calf. The total
number of primary vaccinations performed with lanoline lymph was 68,212
and with glycerinated lymph 1,458,173 against 256,351 and 1,010,200 during
1921-22 and 535,354 and 882,573 during 1920-21. The percentage of success
under each of these methods was 92'7 and 96 against 96.7 and 96.4 during
1921-22 and 97.7 and 95.8 during 1920-21. The number of re-vaccinations
performed under each of these methods was 26,821 and 452,934 with a success
of 47.8 and 59.8, respectively, against 98,403 and 396,672 with a success of
63.6 and 58.4 per cent. during 1921-22 and 370,095 and 534,254 with a
success of 71.05 and 69.6 per cent. during 1920-21.