Yǐnyòng wèi chǔlǐ de yěwài shuǐyuán róngyì gǎnrǎn jiǎdìchóng.
Drinking untreated water from the wild can easily cause Giardia infection.
Tips
history
Named after French biologist Alfred Giard (1846-1908). Giardiasis — aka 'beaver fever' in North American trail lore — is the commonest reason backcountry hikers are told to filter stream water.
