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Start planning now to attend the 2014 AOHP National Conference in New Orleans from September 10-13, 2014. It is never too early to make plans and to ensure that your time and expenses are budgeted to attend. If you need help to justify your conference attendance with your supervisor, contact AOHP Headquarters for assistance in articulating the value at info@aohp.org. Online Registration is now open:  http://AOHPconference.com.

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Thursday, September 11 • 3:15pm - 4:15pm
A005 Occupational Hazards to Health Care Providers resulting from Aerial Transmission of Infectious Agents: Droplet size, Temperature, Humidity and Other Factors (Advanced)

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Topic Overview:

This presentation will focus on aerial transmission of micro-organisms through the air, including multiple factors that contribute to transmission and how to select proper prevention methods. Topics that will be discussed are:

  • Aerosol; large droplets; droplet nuclei.
  • Emission of the contaminated aerosol:
  1. Infected individuals: mechanisms of production; influence on the aerosol/droplet properties; infectious dose.
  2. Environmental sources: humidifiers; cooling towers.
  • Transport of droplets through the air; persistence in the air in relation to droplet size, temperature, humidity, air currents; heat and mass interaction between the bio-aerosol and the air; distance traveled.
  • Time evolution of the microorganism viability.
  • Air currents; air exchange; ventilation; negative pressure.
  • Inhalation and deposition of droplets on the respiratory tract.
  • HEPA filters; simple masks; N95 masks; powered air purifying respirators.
  • Aerosols as biological weapons.



  1. Investigate prevention at the sources of aerosols and droplets.
  2. Describe environmental factors contributing to dispersion of droplets/aerosols.
  3. Select appropriate preventive measures against inhalation of infectious agents.
  4. Implement a comprehensive infection control plan adapted to the conditions.

avatar for Raoult Ratard, MD, MS, MPH

Raoult Ratard, MD, MS, MPH

Raoult Ratard is the Louisiana State Epidemiologist. He serves as the Louisiana Office of Public Health Chief of the Infectious Disease Epidemiology Section and as the consultant for the Environmental Epidemiology Section. He earned an MD from the University of Paris Medical School, France, specializing in tropical medicine, microbiology and immunology. Later, he obtained a Master of Science in Parasitology from LSU Medical Center, New Orleans... Read More →

Thursday September 11, 2014 3:15pm - 4:15pm
Napoleon Ballroom 3/F

Attendees (9)