As the Occupational Health Nurse in a Factory Finds That

As the occupational health nurse in a factory finds that five employees out of 30 have positive tuberculin skin test results. One employee on the 3-to-11 shift has been diagnosed with active tuberculosis (TB) . She asks if this means that the whole factory has been exposed. Which factor would the nurse point out would most likely increase the possibility of infecting others? (Select all that apply.)

A) Concentration of infectious droplet nuclei in the air
B) Duration of exposure to the infected person
C) Proximity to the infected person
D) The use of safety gloves by employees
E) Physical exertion required in the job