The following background data on Cryptosporidiosis in Australia are abstracted from Gideon www.GideonOnline.com and the Gideon e-book series. [1,2] :

Rates of Cryptosporidiosis in Australia are somewhat higher than those in New Zealand, and 7- to 8-fold those reported in the United States. (see graph) [3]

Infecting species:
- Sporadic cases of cryptosporidiosis are caused by Cryptosporidium hominis, C. parvum, C. andersoni and C. fayeri
- Cryptosporidium parvum has been detected in the Sydney water supply since 1998.
- Cryptosporidium canis has been recovered from dogs, and C. felis from cats – neither posing a significant public health risk to humans.
- Cryptosporidium sp. have been recovered from urban-adapted Common brushtail possums (Trichosurus vulpecula) and barramundi (Lates calcarifer)
- Cryptosporidium cuniculus has been identified in rabbits.
- Cryptosporidium fayeri, a species associated with marsupials, has been identified in a case of human infection.

Prevalence surveys:
2.2% of HIV-positive MSM, 0.6% of HIV-negative MSM and 3% of controls (Sydney, 2003 to 2006)
0.8% of stool samples from symptomatic and asymptomatic subjects (Sydney, 2008 to 2009)
24.5% of pre-weaned sheep (Western Australia, 2009 publication)
22.3% of pre-weaned calves (Western Australia and New South Wales, 2010 publication)
58.5% of dairy and beef calves with diarrhea (Cryptosporidium spp., 2011 publication)
8.5% of fecal samples from animals living in Sydney water catchments (Cryptosporidium spp., 2011 publication)
71.4% to 81.3% of fecal samples from lambs in southern Western Australia (2011 publication)
9.3% of western grey kangaroos (Macropus fuliginosus) in Western Australia – 25% of these identified as Cryptosporidium fayeri (2011 publication)

Notable outbreaks:
1991 (publication year) – An outbreak of cryptosporidiosis was reported among children in Adelaide.
1994 to 1995 – Outbreaks (70 cases) were reported in the Sutherland area of Sydney during September 1994 to January 1995 – 17 of these acquired from a swimming pool.
1998 – An outbreak (161 cases confirmed) was reported in The Australian Capital Territory – 60% related to two public swimming pools.
1998 – Outbreaks related to swimming pools was reported in Brisbane, Sydney and Melbourne.
2001 – An outbreak (47 cases) in Tasmania was ascribed to animal contact at an agricultural show.
2002 (publication year) – An outbreak was associated with drinking unpasteurized milk.
2005 – Outbreaks (180 cases, approximate) were associated with swimming pools in New South Wales.
2008 – An outbreak in Sydney was associated with a swimming pool.
2009 – An outbreak (1,141 cases) was associated with swimming pools in New South Wales.
2009 – An outbreak (628 cases during January to March) was reported in Sydney.

References:
1. Berger SA. Infectious Diseases of Australia, 2012. 515 pp, 160 graphs, 2930 references, http://www.gideononline.com/ebooks/country/infectious-diseases-of-australia/
2. Berger SA. Cryptosporidiosis: Global Status, 2012. 77 pp, 47 graphs, 995 references. Gideon e-book series, http://www.gideononline.com/ebooks/disease/cryptosporidiosis-global-status/
3. See Gideon graph tool at http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps

Featured on ProMED

Notwithstanding a recent outbreak in Georgia, Cyclospora is the least common intestinal protozoan reported in the United States. [1] In the following chart, I have summarized the incidence of cyclosporiasis, giardiasis, amebiasis and cryptosporidiosis. As indicated at the black arrow, ongoing trends for amebiasis (no longer reported as of 1994 = 2,983 cases) were “continued” by reports of cryptosporidiosis (2,972 cases in 1995).

(outline of Gideon Graph module – see http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps)

Reference:
1. Berger SA. Infectious Diseases of the United States, 2011. 1030 pp, 464 graphs, 8237 references. Gideon e-books, www.gideononline.com/ebooks/country/infectious-diseases-of-the-united-states/

Note published in ProMED

Prior to a recent outbreak in Jamtland, Cryptosporidium had been the least common reported cause of diarrhea in Sweden – see graph

The following background data are abstracted from the Gideon e-book series. 1,2

Prevalence surveys:
2% of adult patients with diarrhea (2000 publication)
24% of untreated surface water supplies in 1996; 40% in 1997
52% of calves, 29% of young stock and 5.6% of cows in dairy herds (2005 to 2007)

One waterborne outbreak was reported during 1986 to 1996.

Notable outbreaks:
2002 – An outbreak (800 to 1,000 cases) was reported among visitors to a public swimming pool.
2007 – An outbreak was reported at a daycare center in the Stockholm area.
2007 – An outbreak (25 cases) was reported among Swedish guests at a hotel in Norway.
2008 – An outbreak (21 cases) was reported among guests at a wedding reception in a hotel in Stockholm.

References:
1. Berger SA. Infectious Diseases of Sweden, 2010, 414 pp., 1,219 references. Gideon e-book series, http://www.gideononline.com/ebooks/country/infectious-diseases-of-sweden/
2. Berger SA. Cryptosporidiosis: Global Status, 2010, 66 pp., 843 references. Gideon e-book series, http://www.gideononline.com/ebooks/disease/cryptosporidiosis-global-status/

Update: Reported in ProMED

Another post in ProMED from Steve describing Cryptosporidiosis in Ireland with a graph comparing rates in neighboring regions:

Background data:
Rates of Cryptosporiosis in Ireland and adjacent countries have been similar since the 1980′s.

Cryptosporidiosis became a notifiable disease in Ireland in January 2004, with 61 percent of cases having been reported during April to June [?2004]. A total of 5 outbreaks (25 outbreak cases) was reported in 2004. A total of 6 outbreaks (49 outbreak cases) was reported in 2005.

Prevalence surveys:
4 percent of gastroenteritis among children.
4 percent of diarrhea requiring hospitalization among Dublin Children 1987.
149 cases were reported among children below age 2 years in 2002; 106 in 2003.
64 patients were hospitalized for cryptosporidiosis in 1999; 57 in 2000; 65 in
2001; 53 in 2002. 70 cases (18 per 100 000) were reported by the South-Eastern Health Board in 2001. 66 cases (19 per 100 000) were reported by the Western Health Board in 2001.

Infected local shellfish species:
_Mytilus edulis_ (Common mussel) in the Sligo Area
_Dreissena polymorpha_ (Zebra mussel) in the Shannon River drainage area.

Notable outbreaks:
2002 – Outbreaks (3 outbreaks, 65 cases) were reported, including a water-borne outbreak more than 32 cases) in the Midland region.
2005 – An outbreak (31 cases) in the western region was associated with contaminated water.
2007 – An outbreak (125 cases) was reported in Galway.

Northern Ireland:
Notable outbreaks:
2000 – An outbreak (121 confirmed cases) was reported – with most cases in the County Antrim and County Down towns of Lisburn and Bangor.
2001 – An outbreak (230 confirmed cases) was reported in Belfast – source unknown.
2001 – An outbreak (57 cases) was reported in Ulster – source unknown.
2001 – An outbreak (110 cases) was reported in Eastern Health Board – ascribed to contamination of water from the Dunmore treatment facility.
2003 – An outbreak (391 cases) was reported among British tourists at a hotel in Majorca – 179 from England and Wales, 170 from Scotland and 42 from Northern Ireland.
2004 – An outbreak (14 cases) was reported in the Midland Health Board – ascribed to a contaminated water supply.