Evolution of the virus has resulted in inconsistent responses to traditional vaccines.

But that is a more traditional antiviral vaccine that works because cervical cancer is caused by a virus.

This has made Swine influenza a bigger problem, mainly because traditional vaccines against influenza do not always work against Swine influenza.

Control of swine influenza by vaccination has become more difficult in recent decades, as the evolution of the virus has resulted in inconsistent responses to traditional vaccines.

Immunization with DNA mimics an actual infection more closely than a traditional vaccine does.

With a traditional vaccine, an artificial virus protein, or antigen, acts as a stimulus for antibody production.

There are four types of traditional vaccines:

But scientists say the novel vaccine also holds promise for rallying the body's immune system against diseases that have otherwise proved resistant to traditional vaccines or other types of therapy.

Immunoglobulins do not provide long-term protection in the same way as a traditional vaccine.

Many drug companies have been discouraged from the business because of liability risks stemming from the severe reactions that traditional vaccines have produced in some people.