Number of people diagnosed with HIV infection and percentage with CD4<200 or diagnosed with opportunistic illness at or within 3 months of HIV diagnosis, by country of residence.

aIncludes cases of HIV infection, newly diagnosed in Australia in 2010 and reported by 31 March 2012. The exposure category “Heterosexual contact” includes cases from high prevalence countries in sub-Saharan Africa and specific countries in South East Asia (Burma, Cambodia).bDataset is not nationally representative; it includes data from 5 of the 13 provinces and territories. Across all 13 provinces and territories, a total of 2,358 HIV cases were reported in 2010. The case definition for AIDS in Canada is based on confirmed HIV diagnosis and presence/diagnosis of an AIDS-defining condition (no criteria for CD4 count are included in Canada’s AIDS case definition).cData for the whole country, adjusted for under-reporting and reporting delays. Missing data on age,sex, transmission category and clinical stage are imputed. Data reported as of 30 June, 2011. MSM-IDU are in “others”.dIn 2010 the coverage of HIV surveillance system is 97.8%. AIDS is undereported. AIDS defined as clinical stage C (CDC classification).eIncludes cases of HIV infection, newly diagnosed in the United States in 2010 and reported by 31 December 2011. Estimated numbers resulted from statistical adjustment that accounted for missing risk-factor information, but not for reporting delays and incomplete reporting.fMSM, men who have sex with men; IDU, injection drug use.