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However, the widespread availability of successful antiretroviral therapy means that both new AIDS cases and AIDS mortality have been declining in countries with high coverage of antiretroviral therapy The scale-up of services for ART, preventing mother-to-child transmission of HIV (PMTCT) and HIV counselling and testing has led to an increase in the numbers of adults and children being tested and diagnosed with HIV infection. Accurate data are needed on adults and children diagnosed with HIV infection to facilitate estimation of the treatment and care burden, to plan for effective prevention and care interventions and assess care interventions. WHO therefore recommends that countries consider conducting reporting of newly diagnosed cases of HIV infection in adults and children. The requirements for the confidentiality and security of HIV surveillance data are the same as for AIDS-related reporting. Provider-initiated reporting will be required to increase the completeness, timeliness and efficiency of HIV case reporting. Laboratory-initiated reporting alone will be insufficient for reporting HIV, as other surveillance information from the health care provider or medical records will be required. For the purposes of HIV case definitions for reporting and surveillance, children are defined as younger than 15 years of age and adults as 15 years or older.