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  1. Tar- causes cancer and increases coughing and production of sputum. Smoking is closely associated with pulmonary emphysema and chronic bronchitis. It increases your risk of developing various cancers (such as lung cancer, oral cancer, laryngeal cancer, oesophageal cancer), heart disease and gastric ulcers.

  2. 3. The majority of infections and deaths due to malaria are preventable. According to WHO, travellers and their advisers should note the following five principles of malaria prevention (the ABCDE):1. Be Aware of the risk, the incubation period, the possibility of delayed onset and the main symptoms;

  3. It is endemic in the tropical Africa and South America where the WHO estimates an annual incidence of 200,000 cases with 30,000 deaths.(1) This paper reviews the global and local epidemiology of yellow fever, examines the potential risks of yellow fever in Hong Kong and discusses the preventive strategies.

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