M 131
Records obtained from the R.A.M.C. authorities regarding incidence of malarial infection amongst the troops, British and Indian, are as follows, (relapses not being taken into account) : British troops, number of cases of malaria contracted during the year was 45, of which one occurred in 1st Quarter, 3 in 2nd Quarter, 16 in 3rd Quarter, 25 in 4th Quarter. Calculated on an average strength of 2,271, the admission rate for the year was 19.82 per 1,000. Amongst the Indian troops there were 24 infections, of which there was none in 1st Quarter, 6 in 2nd Quarter, 10 in 3rd Quarter, 8 in 4th Quarter. These work out for the year as 18.00 per 1,000 on an average strength of 1,389.
Dengue.
Ten cases were admitted to the Government Hospitals in 1932. No specimens of Aedes argenteus were met with, but Aedes albopictus were frequently encountered. This mosquito has been experimentally infected with dengue in other countries.
Filaria.
Two cases of disease due to filarial infection were reported from the Government Hospitals during the year. Whilst dissecting an Anopheles minimus obtained from the Wong Chuk Hang Village area for malarial infection, a filaria worm was observed emerging from the head after it had been pulled off. On the thorax being teased out, more worms were observed. Afterwards other A. minimus were found infected from this area. In consequence thick blood films were obtained from 106 residents in the locality; these were taken at 10 p.m. in the month of June. Microfilaria were found in 13 of these or 12.26 per cent, and malaria parasites in 6 or 4.62 per cent. One person harboured both kinds of parasites. Practically all stages of development were met with in A. minimus, the earliest being a worm which having penetrated the midgut had become entangled in the tracheal tubes on the exterior. Sausage shaped forms were found in the thorax, also long motile forms, and long motile forms in the head. No worms were met with in the proboscis although frequently looked for, but these mosquitoes are usually only kept until midgut appears free from blood.
Complete development of the filarial parasite in the alimentary canal, and the narrowing of the worm beyond the anus, has been observed in some of the specimens. Seven A. minimus have on dissection been found infected with malarial and filarial parasites. On thirteen occasions the worms have been found in the abdominal cavity of the insect. C. fatigans and A. jeyporiensis have also been found infected. In the case of the C. fatigans, the worms were all of the long motile variety, they were met with in thorax and head but not in proboscis. No long forms were found in A. jeyporiensis. Results of dissections for filaria are shown in Table XII. Six thick films from one thousand five hundred and thirty
M 131
Records obtained from the R.A.M.C. authorities regarding incidence of malarial infection amongst the troops, British and Indian, are as follows, (relapses not being taken into account) :· British troops, number of cases of malaria contracted during the year was 45, of which one occurred in 1st. Quarter, 3 in 2nd. Quarter, 16 in 3rd. Quarter, 25 in 4th. Quarter. Calculated on an average strength of 2,271, the admission rate for the year was 19.82 per 1,000. Amongst the Indian troops there were 24 infections, of which there was none in 1st. Quarter, 6 in 2nd. Quarter, 10 in 3rd. Quar.er, 8 in 4th. Quarter. These work out for the year as 18.00 per 1,000 on an average strength of 1,389.
Dengue.
Ten cases were admitted to the Government Hospitals in 1932. No specimens of Aedes argenteus were met with, but Aedes albopictus were frequently encountered. This mosquito has been experimentally infected with dengue in other countries.
Filaria.
Two cases of disease due to filarial infection were reported from the Government Hospitals during the year. Whilst dis- secting an Anopheles minimus obtained from the Wong Chuk Hang Village area for malarial infection, a filaria worm was ob- served emerging from the head after i: had been pulled off. On the thorax being teased out, more worms were observed. After- wards other A. minimus were found infected from this area. In consequence thick blood films were obtained from 106 residents in the locality; these were taken at 10 p.m. in the month of June. Microfilaria were found in 13 of these or 12.26 per cent, and malaria parasites in 6 or 4.62 per cent. One person harboured both kinds of parasites. Fractically all stages of development were met with in A. minimus, the earliest being a worn which baving penetrated the midgut had become entangled in the tracheal tubes on the exterior. Sausage shaped forms were found in the thorax, also long motile forms, and long motile forms in the head. No worms were met with in the proboscis although frequently looked for, but these mosquitoes are usually only kept until midgut appears free from blood.
Complete developmen of the alimentary canal, and the narrowing of the worm beyond the anus, has been observed in some of the specimens. Seven A. minimus have on dissection been found infected with malarial and filarial parasites. On thirteen occasions the worms have been found in the abdominal cavity of the insect. C. fatigans and A. jeyporiensis have also been found infected. In the case of the C. fatigans, the worms were all of the long motile variety, they were met with in thorax and head but not in proboscis. No long forms were found in A. yporiensis. Results of dissections for filaria are shown in Table XII. Six thick films from one thousand five hundred and thirty
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