The disease which is spread from person to person is known as infectious disease. In this regard, an example of Ebola virus outbreak can be taken into context.
Human to human transmission of Ebola is related to burial practices in humans. When a person affected with Ebola dies, cultural practices involve washing and touching the diseased person. 60% Ebola cases in Guinea have been found due to this reason.
Second, during burial of the diseased, the patient is touched by many other persons, who are involved in burial. At this time also, virus of diseased dead person can come in contact with the unaffected person.