The feasibility of implementation and the validity of these surveillance definitions would benefit from further assessment in different types of LTCFs. As with the original article by McGeer and colleagues, 1 these definitions have not been tested in advance of their publication. Data from a French study demonstrated that application of the original surveillance definitions underestimated the number of nursing home–associated infections when compared with provider diagnoses of infection. 9 This finding highlights the need for future studies to determine the sensitivity and specificity of criteria used within the surveillance definitions and to validate their application in this setting.
Complex media contain often protein hydrolysate which are are excellent natural sources of amino acids, peptides and proteins in growth media. It is the most important source for nitrogenous nutrients. They are most often obtained by enzymatic digestion or acid hydrolysis of natural products, such as animal tissues, milk, plants or microbial cultures. The number of available protein hydrolsate, also called peptones, is enormous and can promote and sustain the growth of most common organisms. For the enzymatic digestion often papain, pepsin, trypsin or a mixture of enzymes of the pancreatic juice are taken. Below is a list of often used expressions and the definitions.