Hi JJay, we've not heard of reports of Malaria in Cuba, only in the DR and Mexico. If you want to get some background information about Malaria the
Canadian public health agency has a good FAQ about it. Even though it's a Canadian site, the info is good anywhere.
We know people who took malaria medication when going to the DR, and some wished they hadn't, they were ill for the whole trip. It's a bit of a double edged sword, isn't it? Get sick from the medication, which is not 100% effective against getting the disease, or risk getting Maliaria...
Hope it helps.