आबु आनि इबन सिनाया ( आभिचेनना ) 11 थि जौथायनि गिबि बाहागोवाव बारदेरग्रा बा सनदेरग्रा बेरामफोरनि आखुखौ दिहुनदोंमोन ।
Abu Ali ibn Sina Avicenna discovered the contagious nature of infectious diseases in the early 11th century .