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community medicine psm mbbs hiv nacp aids aids hiv nacp national aids control program undergraduate tb tuberculosis endtb rntcp who tb history end tb water preservation conservation water conservation waste treatment who protocol waste management waste health care waste bio medical waste vaccination immunization cold chain art ug demographic cyle demography steps epidemic investigation investigation of an epidemic determinants fertility introduction health care delivery system of india micronutrients nutrition minerals vitamins integrated vector management malaria vector management vector malaria protocol malaria treatment malaria diagnosis protocol nvbdcp malaria world aids day pedagogy naco