Viruses that are harmless to their animal hosts, can be deadly when transmitted to humans. 예를 들어, 마카크 헤르페스는 마카크 원숭이에게는 무해하지만 인간에게는 치명적입니다. Many viruses, as innocuous as the common cold or as lethal as Ebola, can be transmitted via a mere cough or sneeze.