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. 2021 Mar 5;70(9):304–307. doi: 10.15585/mmwr.mm7009a2

FIGURE 2.

The figure is a bar chart that shows the reported giardiasis outbreaks, by mode of transmission and year of earliest illness onset date, across the United States, including the District of Columbia, and the U.S. territories, including Puerto Rico, 2012–2017.

Reported giardiasis outbreaks (N = 111), by mode of transmission* and year of earliest illness onset date — United States, 2012–2017

* Transmission modes were categorized as follows: indeterminate/unknown if evidence to implicate one specific primary mode of transmission was insufficient; person-to-person if transmission occurred from direct contact with an infected person, their body fluids, or by contact with the local environment where the exposed person was present; foodborne if transmitted through consumption of contaminated food or non-water beverages; waterborne if transmission occurred via ingestion, inhalation, contact, or another exposure to water (e.g., treated or untreated recreational water, drinking water [including bottled water], or an environmental or indeterminate water source). There were no outbreaks attributed to animal contact or environmental contamination other than food and water (https://www.cdc.gov/nors/forms.html).