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 distemper/parvo vaccination is typically given at 6-8 weeks of age and boosted 2 times at three week intervals, and again a year later. Like rabies, after the first year, distemper/parvo can be given as a 3 year vaccine, ONLY if the pet has stayed on a veterinarian recommended vaccine schedule.istemper/parvo is not a vaccine required by law, however it is considered a core vaccine (a vaccine that should be given to all animals of a certain species). Both dogs and cats receive some form of the distemper/parvo vaccine. In cats, distemper is known as panleukopenia.