Researchers, buoyed by news that a single dose of swine flu vaccine is enough to ensure adult immunity, said over the weekend that they were confident that the spread of disease could be stalled.

Since it was first detected in Mexico earlier this year, swine flu has killed over 3,200 people worldwide.

"This is really good news that one dose works. We can expect to have twice a many doses and we will have vaccines for more people than we though earlier," said Nancy Cox, a flu expert at the US government-run Centers for Disease Control.

In another dose of good news, scientists believe the H1N1 virus does not contain a protein which is seen as causing more serious infections.

"The bottom line is that (the protein) generates a lot of inflammation that you see during influenza virus infections," said Jonathan McCullers of St Jude Children's Research Hospital.

The lack of the protein, which "increases the virulence of the virus itself and also helps secondary bacterial pathogens," could point lower fatality rates, he added.

But there are still concerns that the virus may become drug-resistant, prompting scientists to look at new vaccine variations.

An experimental treatment by the US-firm NexBio Inc. prevents seasonal flu from infecting cells and could be successful in preventing new H1N1 strains that are resistant to Tamiflu, one of three anti-virals currently on the market.

In a statement NexBio said "extensive, prolonged nonclinical influenza studies have not shown the development of any meaningful resistance" to the new treatment.

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