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Causes of Giardia

Primary Cause of Giardia

The primary cause of Giardia is the result:

  • of eating food from an animal infected with an infectious agent, or from food that is contaminated from the food handler (who is infected with Giardia), or from contaminated soil or water, or from toxins produced by an infectious organism.
  • of transmission of an infectious agent by another person by one or more of the following: saliva, air, cough, fecal-oral route, surfaces, blood, needles, blood transfusions, sexual contact, mother to fetus, etc.

Giardia Causes: Risk Factors

The following conditions have been cited in various sources as potentially causal risk factors related to Giardia:

Giardia: Related Medical Conditions

To research the causes of Giardia, consider researching the causes of these these diseases that may be similar, or associated with Giardia:

Giardia: Causes and Types

Causes of Broader Categories of Giardia: Review the causal information about the various more general categories of medical conditions:

Giardia as a complication of other conditions:

Other conditions that might have Giardia as a complication may, potentially, be an underlying cause of Giardia. Our database lists the following as having Giardia as a complication of that condition:

What causes Giardia?

Causes: Giardia: Parasitic infection, sometimes in contaminated water sources.
Surveillance Organisms that appear identical to those that cause human illness have been isolated from domestic animals (dogs and cats) and wild animals (beavers and bears). A related but morphologically distinct organism infects rodents, although rodents may be infected with human isolates in the laboratory. Human giardiasis may involve diarrhea within 1 week of ingestion of the cyst, which is the environmental survival form and infective stage of the organism. (Source: FDA Bad Bug Book)

Related information on causes of Giardia:

As with all medical conditions, there may be many causal factors. Further relevant information on causes of Giardia may be found in:


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