Charak Samhita
विकारसामान्यगुणे देशे कालेऽथवा भिषक्। दूतमभ्यागतं दृष्ट्वा नातुरं तमुपाचरेत् ॥१५॥
An informer explains the same symptoms in his patient, as seen in epidemic in that area, then the physician should avoid to treat such incurable diseases.
english translation
vikArasAmAnyaguNe deze kAle'thavA bhiSak। dUtamabhyAgataM dRSTvA nAturaM tamupAcaret ॥15॥
hk transliteration by Sanscript