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Preventive MedicinePublic Health Administration
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acid allowed amount animal appear areas arrangements becomes blood body building carried cause cent child common consists contains countries covered dangerous death depends diet direct disease disinfection drain dust effect eggs epidemic examination factor feet fever filter give given ground head heat human important inches increased India infection known less living malaria material matter means measures mental method milk nature necessary occurs organisms pass patient period persons pipe population possible practice prevent produced proper protected protein public health regard removed sanitary sewage skin social soil solution spread standard supply surface taken tank temperature tion treatment usually vaccine vegetable ventilation vitamin washing