There are 4 calories in 1 ounce of Iceberg Lettuce (Includes Crisphead Types). Calorie breakdown: 8% fat, 76% carbs, 16% protein.
Cryptosporidium (crip-toe-spor-ID-ee-um) is a protozoan, a single-celled parasite that lives in the intestines of animals and people.
The following groups have an elevated risk of being exposed to Cryptosporidium: 1  People who swim regularly in pools with insufficient sanitation (certain strains of Cryptosporidium are chlorine-resistant) 2  Child-care workers. 3  Parents of infected children. 4  People caring for other people with cryptosporidiosis.