有可能出现无症状携带者,至少可见于幼童人群,[8]Pettoello-Mantovani M, Di Martino L, Dettori G, et al. Asymptomatic carriage of intestinal Cryptosporidium immunocompetent and immunodeficient children: a prospective study. Pediatr Infect Dis J. 1995;14:1042-1047.http://www.ncbi.nlm.nih.gov/pubmed/8745015?tool=bestpractice.com[9]Isaacs D, Hunt GH, Phillpis AD, et al. Cryptosporidiosis in immunocompentent children. J Clin Pathol. 1985;38:76-81.http://www.ncbi.nlm.nih.gov/pubmed/4038504?tool=bestpractice.com[10]Baxby D, Hart CA. The incidence of cryptosporidiosis: a two-year prospective survey in a children's hospital. J Hyg (Lond). 1986;96:107-111.http://www.ncbi.nlm.nih.gov/pubmed/3950390?tool=bestpractice.com[11]Addiss DG, Stewart JM, Finton RJ, et al. Giardia lamblia and Cryptosporidium infections in child day-care centers in Fulton County, Georgia. Pediatr Infect Dis J. 1991;10:907-911.http://www.ncbi.nlm.nih.gov/pubmed/1766706?tool=bestpractice.com[12]García-Rodríguez JA, Martín-Sánchez AM, Canut Blasco A, et al. The prevalence of Cryptosporidium species in children in day care centres and primary schools in Salamanca (Spain): an epidemiological study. Eur J Epidemiol. 1990;6:432-435.http://www.ncbi.nlm.nih.gov/pubmed/2091947?tool=bestpractice.com[13]Davies AP, Campbell B, Evans MR, et al. Asymptomatic carriage of protozoan parasites in children in day care centers in the United Kingdom. Pediatr Infect Dis J. 2009;28:838-840.http://www.ncbi.nlm.nih.gov/pubmed/19684527?tool=bestpractice.com但不建议进行筛检,因为其临床意义不确定,任何根除性治疗措施的有效性仍待证实。