Most identifiersin the Java(TM) programming environment have either class or local scope. Instance and classvariables and methods have class scope; they can be used outside the class and its subclasses onlyby prefixing them with an instance of the class or (for class variables and methods) with the classname.
Acyclovir was the first successful antiviral agent in the world. It was originally synthesized in 1974 by Howard Schaeffer at Wellcome Research Laboratories (now GlaxoSmithKline).
The first hepatitis B vaccine was approved in the United States in 1981. A safer version came to market in 1986. It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system.