The major form of control of viral diseases has been

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Control of many viral diseases has been accomplished by vaccination. Attenuated-live or inactivated-dead viral vaccines have been used successively to prevent yellow fever, poliomyelitis, measles, mumps, rubella, hepatitis B, and influenza. Smallpox was eliminated in 1977 by an effective vaccination program. Additional vaccines continue to appear. New smallpox vaccines with fewer side effects are being developed to prevent outbreaks in the event of bioterrorism. A live, attenuated varicella (chickenpox) vaccine is now recommended for all children, and an inactivated hepatitis A vaccine is available for travelers or others entering areas of higher endemicity. Influenza vaccination is needed annually because of antigenic drift, or occasional major antigenic shift, of circulating virus. Research continues with a rotavirus vaccine that should be available soon.

The Major Form of Control of Viral Diseases Has Been