Disease expression comes based on inocula multiplication at a particular site. If it is systemic sufficient amount of inocula it should generate. Otherwise it becomes asymptomatic and stagnates in pockets and express different disease in human beings

Thanks to Cuntheepuram Lakshminarasimhan for your comments.

Good Answer Cuntheepuram Lakshminarasimhan

During the incubation period inoculum or viger will be more .During this period any appropriate host or substrate comes in comntact the disease will spread'

Thanks Cuntheepuram Lakshminarasimhan for your valued input.

welcome