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.
Supportive care is the only treatment for canine distemper. Vaccination of susceptible domestic animals and the removal of animal carcasses can help to control outbreaks. The reduction of wild carnivore populations can also help to decrease the availability of potential hosts. Feline distemper is caused by a parvovirus. It is a highly contagious disease that affects members of the Felidae, Procyonidae, and Mustelidae families. Susceptible animals include, but are not limited to, domestic cats, bobcats, ferrets, weasels, skunks, and raccoons.