By Geoffrey A. Taylor
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Additional resources for Bacteriology for Nurses
Infections of the urinary tract with spore-bearing organisms are very uncommon and so the risk is generally considered to be justified. Sterilisation by moist heat at temperatures greater than 100°C is carried out in an autoclave (Fig. 11). This is a device in which objects may be heated in the presence of saturated steam at pressures higher than atmospheric. Temperatures safety inlet thermometer ' pressure outlet FIG. 11. Illustrates the appearances of a simple autoclave. The cutaway section shows the double shell construction, and the arrows show the path of the pressurised steam.
Dressings, should be placed in a polythene bag, sealed, and then burnt in an incinerator. Those which cannot be burnt should be placed in a suitable container, autoclaved to render handling safe, and then be handed over to the local authority refuse disposal service. Disposable plastic syringes have become a large problem in many hospitals. Although they may be burnt with difficulty, the smell produced is offensive and the melting plastic tends to impare the efficiency of the incinerator. They should be treated as non-combustible disposable objects.
The walls of the blood vessels allow plasma to escape into the tissue spaces and the white cells of the blood migrate into the tissue. This causes a swelling of the part. The white cells of the blood, together with certain tissue cells, move towards the bacteria and attempt to ingest them by a process known as PHAGOCYTOSIS (Fig. 10). In some instances phagocytosis may kill the bacterium, in others the white blood cell (phagocyte) may itself be killed. By surrounding the area of infection with plasma which often clots, and with phagocytes, the infection may be prevented from spreading.
Bacteriology for Nurses by Geoffrey A. Taylor