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PDC 6 - Introduction to the Recognit​​ion, Evaluation, and Control of Legionella in Building Water Systems

Enterprise Risk Management and Risk Assessment​ Track

Introductory | Credits: 4 CM Credit Hours 

Sunday, October 29 | 8:00 AM – Noon | Limit 40


This PDC will provide the basic framework for understanding the principles of the recognition, evaluation, and control of Legionella in various building water systems for the purposes of infection prevention. The main emphasis of the course will be on technical strategies for environmental exposure and risk assessment in order to provide an understanding of data collection and interpretation in support of environmental source identification. Fundamental core competencies include basic knowledge of Legionella sources, environmental sampling, and appropriate control measures for Legionella amplification sources. A combination of lecture and case study reviews will equip the attendees with an array of resources to meet learning objectives. Published standards and guidelines will also be covered.

*Please note: Only participants registering for two (2) half-day PDCs on the same day will receive a boxed lunch.


Past general microbiology coursework is preferred. It’s also recommended that you register for PDC 12: Implementing a Water Management Plan to Control Legionella in Building Water Systems. 

Learning Aids

Participants must bring a laptop or tablet/iPad with them to the course.

Value Added

Each participant will receive a PDF copy of "Recognition, Evaluation, and Control of Legionella in Building Water Systems."

Course Outline

  • Introduction to Waterborne Pathogens
  • History and Background
  • Core Competencies
  • Microbiology of Legionella
  • Introduction to Water Systems
  • Assessment of Water Sources
  • Interpretation of Environmental Data
  • Control of Waterborne Pathogens
  • Outbreak Investigation
  • Prevention and Water Management Plans
  • Case Studies

Learning Outcomes

Upon completion, participants will be able to:

  • Develop an understanding of the microbiology and growth conditions of waterborne pathogens. 
  • Compile knowledge of various water systems that may be impacted by waterborne pathogens. 
  • Identify strategies for risk assessments associated with waterborne pathogen contamination. 
  • Describe current approaches to controlling Legionella in building water systems.

Transfer of Knowledge

Instructors will evaluate participants’ understanding of the materials presented based on:

  • Practice exercises​​​


Name and Bio

Hung Cheung, MD, MPH, FACOEM, Founder & President, Cogency Medical, Baltimore, MD.

As one of the nation’s foremost experts in his field, Dr. Cheung has led hundreds of environmental and toxicological investigations, protecting thousands of occupants and saving organizations millions of dollars.

A former Maryland State Medical Director, he is a faculty member at Johns Hopkins Bloomberg School of Public Health. As a Fellow of the American College and Environmental Medicine, he is nationally-recognized as an expert in Respiratory Environmental Medicine, Plant and Indoor Environmental Quality, Risk Communication and Medical Advisory Services. Board Certified in both Internal Medicine and Preventive Medicine, he holds a Masters in Public Health from Johns Hopkins and has a medical degree from the University of Maryland.

Dr. Cheung currently serves on the Advisory Panel for the Johns Hopkins Bloomberg School of Hygiene and Public Health Department of Environmental Health Sciences and Board of Directors for Healthy Housing Solutions, Inc. He is also the acting Course and Rotation Director for the Occupational and Environmental Medicine Residency Program at the University of Pennsylvania Perelman School of Medicine.

He serves with the Maryland Governor’s Task Force on Indoor Air Quality, the Baltimore City Healthy Homes Advisory Board and completing a major investigational study for the Department of Defense.​

John (David) Krause, PhD, MSPH, CIH, Toxicologist, Director Southeast Operations, Forensic Analytical Consulting Services, Inc., Tallahassee, FL.

J. David Krause is the lead Toxicologist and Director of Southeast Operations for Forensic Analytical Consulting Services (FACS) based in Florida with 23 years of experience focused on building health sciences. He has experience in public health and private sector consulting in the areas of occupational health, industrial hygiene, indoor air quality, chemical emission testing, toxicology, and litigation support. He regularly consults with clients seeking to investigate and resolve chemical and biological exposure concerns in workplace and community environments.​