Make the given paragraph more logical
Older cats tend to have gastrointestinal lymphoma without FeLV infection. Tests more sensitive to low level FeLV infections and replication-defective FeLV have found that many of these cats have been previously exposed.
Older cats tend to have gastrointestinal lymphoma without FeLV infection, although tests more sensitive to low level FeLV infections and replication-defective FeLV have found that many of these cats have been previously exposed.