Good Day Doc,,i Have A Daughter 4 Yr Old,and She

good day doc,,i have a daughter 4 yr old,and she just having a cough and congestion last month,i bought her a DELSYM,after taking in 2 weeks it goes away,and after one month it come back again and shes taking delsym again,and little by little her cough goes away,i scared she might have primary complex,because my step daughter shes positive with tb test,and after a week of taking vit her tb test went inactive,