Definition of "giardiasis" [giardiasis]

• Intestinal infection with the protozoan Giardia lamblia. It is usually asymptomatic in humans but may produce abdominal cramps, diarrhea, and nausea. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""For backcountry users in North America, giardiasis is the most common wilderness-acquired infection causing diarrhea," says Dr. Howard Backer, who has a master's in public health and is past president of the Wilderness Medical Society."
• "In fact, 61 percent of fatigued patients with giardiasis had been diagnosed elsewhere as suffering from chronic fatigue immune dysfunction syndrome CFIDS, compared to only 19 percent of fatigued patients without giardiasis."
• "The test revealed infection with a parasite called Giardia lamblia, a condition called giardiasis."