Question

why is the pricking needle to be used only once​

Answer 1

Answer:

And there are finger-pricking devices intended for use on more than one person. These have both a disposable lancet and disposable plastic tip surrounding the lancet, so that all parts, which come into contact with the patient's skin, can be discarded to minimise the risk of transmission of disease.

Answer 2

so that the infection does not spread from person to person .......... I. e, to decrease communicable dieseas....

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