Authors’ Reply to the Comment on: “Pulmonary Tuberculosis Seasonality Survey in the Fars Province, South of Iran”

We thank the authors for their interest and comments on our manuscript (1). As it was mentioned by the authors, apparently more frequent diagnosis of tuberculosis in warm seasons may be a reflection of more frequent acquisition of organism during cold seasons, which is due to crowding, low immunity and low level of vitamin D, and less diagnostic confusion with common upper respiratory tract infection (2, 3). However, due to the design of our study, which was retrospective and also poor recording of patient initiation symptom in our registry, we could not find the exact causes of seemingly tuberculosis diagnosis in warm seasons.