The risk drops to about 30 % at about 6 months and 5 - 15 % after a year of age when they then develop a natural resistance to the disease. (justcatsvet.com)
There might be genes for resistance to these diseases in wild cocoa. (newscientist.com)
We might not have expected much resistance to the disease in earlier times, before evidence accumulated that the fears it inspired were irrational. (thebreakthrough.org)