Which of the following statements about normal microflora of the respiratory system is incorrect

A)The presence of Haemophilus in the pharynx does not indicate disease.
B)About 1/3 of the population carries Staphylococcus aureus in their nasal cavity.
C)Coccidioides immitis is a harmless part of the microflora.
D)Nasal carriers of Staphylococcus aureus can easily spread it to other individuals.