What is the asymptomatic carriage rate of giardiasis in children?

Updated: Oct 01, 2018
  • Author: Hisham Nazer, MBBCh, FRCP, DTM&H; Chief Editor: Burt Cagir, MD, FACS  more...
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The asymptomatic carriage rate in children may be as high as 20% in southern regions and in children younger than 36 months who attend daycare centers. Asymptomatic carriage may persist for several months. Many children with giardiasis are symptomatic, have been shown to spread the disease within their homes, and may contribute to high endemic rates in their communities. [18]

In the 46 states reporting giardiasis, the mean number of cases per 100,000 population varies by state, with a range of 0.1-23.5 cases. Most cases are reported between June and October and are associated with the summer recreational water season and camping. [39]

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