Bronchial washing collected with a double lumen–plugged catheter is:
a. acceptable.
b. not acceptable.
A
Because indigenous anaerobes are often present in large numbers as normal flora on mucosal surfaces, even minimal contamination of a specimen can give misleading results. Specimens that are likely to be contaminated are unacceptable for anaerobic culture. Respiratory secretions that pass through the upper respiratory tract will likely be contaminated with upper respiratory tract flora, but those that are collected in a way that protects the specimen are acceptable.
You might also like to view...
Nitrogen has a higher electronegativity than hydrogen. As a result you would expect that ammonia (NH3) molecules can form ____ with each other
A. ionic bonds B. hydrophilic bonds C. hydrogen bonds D. cohesive bonds E. covalent bonds
Water
A. is nonpolar. B. has a low heat of vaporization. C. has cohesive properties. D. evaporates and increases body temperature. E. is a relatively poor solvent.
In many animals, this polysaccharide is found in large quantities in liver and muscle cells. It is highly
branched, with many ?(1-4) and ?(1-6) linkages.
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
Birds are the only modern amniotes with ____
a. wings b. feathers c. a four-chambered heart d. ectothermic metabolism e. more than one of these