"So far, it has infected more than 700 people worldwide and has killed about 60 percent of them. Unfortunately, it has a high mortality rate," he pointed out.

The researchers developed the vaccine for H5N1 by combining two viruses. A vaccine strain of the Newcastle disease virus, a virus that naturally affects poultry, was cloned and a small section of the H5N1 virus was transplanted into the Newcastle disease virus vaccine, creating a recombinant virus.

Tests showed that the new recombinant virus protected chickens against both Newcastle disease virus and H5N1. Researchers also examined the avian flu subtype H7N9, an emerging zoonotic strain. Using the same method for developing the H5N1 vaccine, the researchers inserted a small section of the H7N9 virus into the Newcastle disease virus vaccine.

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