On Tuesday, the Colorado Department of Public Health and Environment received results of water sampling in Alamosa performed by the U.S. Centers for Disease Control and Prevention (CDC).
The results showed the presence of Giardia and Cryptosporidium, two parasites that also can cause diarrheal illness.
These samples were drawn by CDC before the water system was flushed and disinfected.
More sampling is needed to confirm that the parasites have been eliminated. New water samples were taken Wednesday by the state’s Water Quality Control Division.
Once testing shows the water is suitable for drinking, the state’s boil order will be lifted. But lab results are not expected on the latest samples until sometime this weekend at the earliest.
As of Tuesday afternoon, there were 389 total cases of salmonella, with 107 of these culture-confirmed and 16 hospitalized.