Physical: The close contact between mother and baby enables mothers to create designer antibodies for their babies in their milk as when the mother encounters the same pathogens as the baby in their environment the mother will produce antibodies that pass directly into her milk and directly to her baby. (aimsireland.ie)
Great apes can fall victim to some of the same pathogens as humans, such as measles and Ebola. (sciencenews.org)
Individual responses to the same pathogen can vary greatly. (sciencedaily.com)