Global problems of imported disease

Effects of Ill Health on the Service of Scottish Presbyterian Missionaries 1867-1929

The experience of Scottish Presbyterian missionaries serving overseas between 1867 and 1929 was analyzed. Data were compiled during a 4-year postgraduate research program from such sources as the General Assembly Reports of the Foreign Mission Committees of the Church of Scotland, numerous missionary magazines, school records, medical directories, and newspaper and medical journal obituaries. Data show that the year of appointment, the mission station and continent location, and medical knowledge were all influencing factors on the length of missionary service, early retirement on account of ill health, death in service, and age at death. This method of comparative, historical study may have further useful applications in looking at the health experience of other groups who lived and worked abroad at the turn of the century, such as civil servants, the military, or other comparable missionary groups.

Pasteurization of naturally contaminated water with solar energy

A solar box cooker (SBC) was constructed with a cooking area deep enough to hold several 3.7-liter jugs of water, and this was used to investigate the potential of using solar energy to pasteurize naturally contaminated water. When river water was heated either in the SBC or on a hot plate, coliform bacteria were inactivated at temperatures of 60 degrees C or greater. Heating water in an SBC to at least 65 degrees C ensures that the water will be above the milk pasteurization temperature of 62.8 degrees C for at least an hour, which appears sufficient to pasteurize contaminated water. On clear or partly cloudy days, with the SBC facing magnetic south in Sacramento, bottom water temperatures of at least 65 degrees C could be obtained in 11.1 liters of water during the 6 weeks on either side of the summer solstice, in 7.4 liters of water from mid-March through mid-September, and in 3.7 liters of water an additional 2 to 3 weeks at the beginning and end of the solar season. Periodic repositioning of the SBC towards the sun, adjusting the back reflective lid, and preheating water in a simple reflective device increased final water temperatures. Simultaneous cooking and heating water to pasteurizing temperatures was possible. Additional uses of the SBC to pasteurize soil and to decontaminate hospital materials before disposal in remote areas are suggested.

Imported parasitic infections in Tasmania

A number of protozoan, trematode, and nematode infections have been imported into Tasmania over an 18-month period. Some of the cases are briefly discussed as they provide features of clinical interest. The increasing problem of imported infections in Australia is emphasized.