One reason for this lower rate is the fact that cats are simply less attractive meals for the mosquitoes that transmit the parasite from host to host.7 There is no known age or sex predilection for infection and «indoor - only» cats are just as likely to become infected as are those that have outdoor access.8 (maddiesfund.org)
There is no breed or sex predilection for this disease, but most patients are young animals under the age of 4 years. (oldenglishsheepdogclubofamerica.org)
However, this disease does not seem to have a sex predilection and both females and neutered males may be affected. (lowchensaustralia.com)