Since humans and nonhuman primates share a close genetic relationship, disease-causing organisms can easily spread between them. Every researcher and member of the husbandry staff who works with macaques and marmosets, monkey body fluids, cell cultures derived from macaques & marmosets, or equipment that has come into contact with infected macaque body fluids, faeces, or urine must be aware of the safety measures needed to prevent the spread of the Herpes B virus.