Bacteria

Bacteria: Kingdom Prokaryotae (Monera)

• No organized nucleus

• Single-celled organisms; are ubiquitous in nature

• Amplification (growth) by an increase in number of cells, not by an increase in size

• Can demonstrate classic exponential growth

Ex: Legionella pneumophila, (a gram-negative, aerobic bacillus) responsible for Legionnaires’ disease, Pontiac fever

• Cooling towers, fountains, hot tubs, building water systems

• See ASHRAE Guideline 12-2000:  Minimizing the Risk of Legionellosis Associated with Building Water Systems

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