A team of Japanese researchers has developed a mosquito that spreads vaccine instead of disease.

The new research, led by Associate Professor Shigeto Yoshida from the Jichi Medical University in Japan, has revealed that mosquito genetic engineering can turn the transmitter into a natural 'flying vaccinator', providing a new strategy for biological control over the disease.

The study targets the saliva gland of the Anopheles stephensi mosquitoes, the main vectors of human malaria. "Blood-sucking arthropods including mosquitoes, sand flies and ticks transmit numerous infectious agents during blood feeding," said Yoshida. "This includes malaria, which kills between 1-2 million people, mostly African children, a year. The lack of an effective vaccine means control of the carrier has become a crucial objective to combating the disease," Yoshida added. For the past decade, it has been theorized that genetic engineering of the mosquito could create a 'flying vaccinator,' raising hopes for their use as a new strategy for malaria control.

However so far research has been limited to a study of the insect's gut and the 'flying vaccinator' theory was not developed.

"Following bites, protective immune responses are induced, just like a conventional vaccination but with no pain and no cost. What's more continuous exposure to bites will maintain high levels of protective immunity, through natural boosting, for a lifetime. So the insect shifts from being a pest to being beneficial," said Yoshida.

In this study, Yoshida and colleagues team successfully generated a transgenic mosquito expressing the Leishmania vaccine within its saliva. Bites from the insect succeeded in raising antibodies, indicating successful immunization with the Leishmania vaccine through blood feeding.

While 'flying vaccinator' theory may now be scientifically possible the question of ethics hangs over the application of the research. A natural and uncontrolled method of delivering vaccines, without dealing with dosage and consent, alongside public acceptance to the release of 'vaccinating' mosquitoes, provide barriers to this method of disease control.