Giardiasis is a diarrheal disease caused by the protist parasite Giardia. The parasite is easily transmitted through contaminated water supplies, and it is the most common human intestinal parasite in the United States.

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*Giardia lamblia* (also known as *G. intestinalis* or *G. duodenalis*) is a widespread flagellated protozoan pathogen within the Fornicata subgroup that lacks mitochondria and causes diarrheal illness (giardiasis). It is transmitted through fecal-contaminated water supplies, where it spreads via environmentally resistant cysts.

*Giardia lamblia*

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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