So a 74xx244 works at a commercial operating temperature, while a 54xx244 which is the same logic device [maybe the same pinout, and package] will continue to operate to the military operating temperature range [which is wider].
A distemper vaccine is more than a preventive against canine distemper virus. This vaccine, considered a core vaccine for all dogs in the United States, also protects against a host of other diseases you may not know your dog is susceptible to. These can include adenovirus, parvovirus, and others.
The Feline Distemper Vaccine. The feline distemper vaccine is the answer to preventing feline distemper. The inoculation is easy to access and is one of the standard shots cats and kittens should receive. It works by introducing the inactive distemper virus to the cat so he can build immunity against it.