Hi and thank you so much for this query. Viral induced conjunctivitis is often accompanied by viral infection of the upper respiratory system. This manifest principally as dry cough. It will not regress over night but would remain a process. I think your doctor is right about it unless there is another infection that sets in in addition to this initial viral infection. I hope this addresses your query fully. Feel free t ask for more information if needed. Thanks for using this panel for your questions.