11. Giardia can cause diarrhea and other gastrointestinal problems.12. Giardia and cryptosporidium are most dangerous to people who already have weakened immune systems.13. The culprit was an outbreak of the potentially deadly microscopic parasites giardia and cryptosporidium. 14. Mittagong ) upstream, so there is possible that water is infected with Giardia . 15. They include " Giardia lamblia ", which causes giardiasis in humans. 16. Giardia lamblia, leishmania, trichomonas vaginalis, and fungi serve as natural hosts.17. Drinking polluted water can also result in Walkerton ), Giardia , or Cryptosporidium. 18. Giardia lamblia cysts ) for a given disinfectant under constant temperature and pH conditions.19. But Spiegel said he commonly finds giardia infecting foreigners who come to the center here. 20. The levels of a second parasite, giardia , were also higher than previously recorded.
