1. According to most surveys and reports the most infectious disease in New York city which is a greatest public health concern is HIV/AIDS. HIV is a silent disease when first acquired, though this latency varies in length. The progression from HIV infection to AIDS varies from 5–12 years. AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. The overall death rate among persons diagnosed with HIV/AIDS in New York City decreased by 62% from 2001 to 2012. According to CDC estimates, 1,218,400 persons aged 13 years and older are living with HIV infection, including 156,300 (12.8%) who are unaware of their infection. 3. The work \'salient\' means most noticeable or prominent features. \"Diseases may be classified or recognized by salient features.\" 4. Steps in investigating an infectious disease outbreak; (a) Identify the source and try to eliminate it as soon as possible (b) Isolate people those infected with the disease to avaoid its spread. (c) Early treatment of infected people. (d) Development of strategies to prevent future outbreaks, calculations of risks and potential hazard in future (e) Create public awareness about the spread of disease/ its symptoms, causees and prevention etc. (f) Evaluate existing prevention strategies (g) Address public concern 5. Worldwide deaths occur even by diseases which are vaccine-reventable. This mainly occurs due to the lack of public awareness. More and more people should be made aware through awareness programmes and informed about the development of new vaccines which can prevent major diseases. This is of prime importance to reduce the death toll. Solution 1. According to most surveys and reports the most infectious disease in New York city which is a greatest public health concern is HIV/AIDS. HIV is a silent disease when first acquired, though this latency varies in length. The progression from HIV infection to AIDS varies from 5–12 years. AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. The overall death rate among persons diagnosed with HIV/AIDS in New York City decreased by 62% from 2001 to 2012. According to CDC estimates, 1,218,400 persons aged 13 years and older are living with HIV infection, including 156,300 (12.8%) who are unaware of their infection. 3. The work \'salient\' means most noticeable or prominent features. \"Diseases may be classified or recognized by salient features.\" 4. Steps in investigating an infectious disease outbreak; (a) Identify the source and try to eliminate it as soon as possible (b) Isolate people those infected with the disease to avaoid its spread. (c) Early treatment of infected people. (d) Development of strategies to prevent future outbreaks, calculations of risks and potential hazard in future (e) Create public awareness about the spread of disease/ its sympt.