Giardia Infection: Data and Publications

At a glance

CDC collects and publishes data about illnesses and outbreaks caused by Giardia. This information helps public health officials better understand how Giardia spreads and prevent future illnesses.

Magnifying glass and pen on top of data charts

Overview

Illness data

In most states and territories, healthcare providers must report Giardia infections to their health department. Health departments can then choose to report these cases of Giardia infection to CDC's tracking system. CDC summarizes and publishes these case data in the reports linked below.

Outbreak data

Health departments investigate possible outbreaks of Giardia infections making multiple people sick. If state health departments identify an outbreak, they can report it to CDC's National Outbreak Reporting System. CDC summarizes and publishes outbreak data in an online data dashboard and in the reports linked below.

Data help prevent disease

Illness and outbreak data help public health officials better understand Giardia and prevent it from making more people sick.

Data and resources

Giardia infection data

Case data

Giardiasis NNDSS Summary Report for 2022
Giardiasis National Notifiable Disease Surveillance System (NNDSS) Summary Report for 2022
Giardiasis NNDSS Summary Report for 2019
Read the Giardiasis NNDSS 2019 Summary Report
New Home for NNDSS Weekly and Annual Tables
Learn how to access weekly and annual NNDSS data on CDC’s website.

Outbreak data

Giardiasis Outbreaks — United States, 2012–2017
MMWR. Morbidity and Mortality Weekly Report / Vol. 70 / No. 9 / P. 304–307
Dashboard: Bacteria, Enterics, Ameba, and Mycotics Data

Publications

Evolving Epidemiology of Reported Giardiasis Cases in the United States, 1995–2016
Case-case analyses of cryptosporidiosis and giardiasis using routine national surveillance data in the United States - 2005-2015
Giardiasis Diagnosis and Treatment Practices Among Commercially Insured Persons in the United States

Tools for public health

Waterborne Disease Outbreak Investigation Toolkit
A detailed resource to assist health departments conduct waterborne disease outbreak investigations.
Tools for Investigators
Access tools for investigating foodborne outbreaks.
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Content Source:
National Center for Emerging and Zoonotic Infectious Diseases (NCEZID)