CF can complicate "normal flora"...but staph can indeed fall into the "normal" category. How a person with CF is affected by it is another factor.
Normal Flora Organisms of the Nose, Nasopharynx, and Oropharynx
A. Most of the surfaces of the upper respiratory tract (including nasal and oral passages, nasopharynx, oropharynx, and trachea) are colonized by normal flora. These organisms are usually regular inhabitants of these surfaces and rarely cause disease. The regular inhabitants of the nose include:
The most common bacteria found in the nose are staphylococci. These organisms are found just inside the nares and include Staphylococcus aureus and S. epidermidis.
In addition to the staphylococci, aerobic corynebacteria ("diphtheroids") can be cultured from the nasal surfaces.
Small numbers of Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae can also be found in the nasopharynx. However, most of these strains are not encapsulated or virulent. It should be noted that nonencapsulated, nontypable H. influenzae has been shown to play a significant role in the pathogenesis of otitis media.
B. The normal flora of the oropharynx also contains a large number of regular bacterial inhabitants.
The nose and the oropharynx contains large numbers of S. aureus and S. epidermidis.
The most important group of microorganisms native to this body niche are the alpha-hemolytic streptococci or viridans streptococci. This group includes S. mitis, S. mutans, S. milleri, and S. salivarius. It is believed that these bacteria act as antagonists against invasion by pathogenic streptococci.
Additionally, cultures from this region usually show large numbers of diphtheroids, Moraxella (formerly Branhamella) catarrhalis, and small Gram-negative cocci related to Neisseria species.
C. The normal flora of these areas have two main functions that play a role in maintaining the healthy state of the host.
The organisms compete with pathogenic organisms for potential attachment sites.
These organisms often produce substances (toxins or acids) which are bactericidal.
see: <a target=_blank class=ftalternatingbarlinklarge href="http://www.atsu.edu/faculty/chamberlain/Website/lectures/lecture/introurt.htm">http://www.atsu.edu/faculty/ch...s/lecture/introurt.htm</a>