My son is 13 months. He had recurring cold caugh and fever. he gained just 900 gms in the last 4 months. though his chest x-ray had no significant abnormality, the mantoux test came as positive with 12mm. As per his pediatrician's advice, we have started the treatment for primary complex from today.. still he is having caugh and slight weezing. when will the caugh and weezing get reduced? is this common?