Table 1.

Characteristics of Cryptosporidium-positive patients clustered in the two municipalities and in the rest of the region, Navarra, Spain, July–December 2012

	First cluster	Second cluster	All other cases
Place	Rural town	Urban municipality	Rural and urban areas
Number of cases	18	55	89
Age range, years	0–14	0–8	1–12
Percentage of patients aged 1–4 years	67%	95%	67%
Male	16 (89%)	36 (65%)	55 (62%)
Attack rate in children aged 0–14 years	1·77%	2·13%	0·09%
Attack rate in children aged 1–4 years	4·69%	4·45%	0·23%
Detection of first and last cases	13 July–11 Nov.	20 Aug.–5 Oct.	23 July–9 Dec.
Week with the highest incidence	23–29 July	27 Aug.–2 Sept.	3–9 Sept.
Bathing in the municipal children's pool	6/10 (60%)	30/33 (91%)	n.d.
Attendance at day-care centres	7/10 (70%)	10/33 (30%)	n.d.
Family members with symptoms	2/10 (20%)	8/33 (24%)	n.d.
Number of Cryptosporidium isolates characterized	7	28	5
Cryptosporidium species identified	C. hominis	C. hominis	C. hominis
Cryptosporidium family and subtypes identified	IaA18R3	IbA10G2R2	IbA10G2R2 and A14R3

n.d., Epidemiological interviews not done.