The viruses that cause feline leukemia and feline AIDS are similar in that they cause immune suppression. Both viruses hold down an infected cat's natural immunity to disease. Your cat’s mouth, nose, lungs, skin and intestines are normally covered with bacteria and viruses. However, the normal immune system keeps these bacteria in check and prevents disease. In feline AIDS or feline leukemia, that natural immunity is reduced to the level that allows any bacteria or virus to multiply and cause disease.
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