A new immunological technique – in which patients are infected with malaria at the same time as being treated with prophylactic chloroquinine drugs – can give immunity against re-infection for at least 2.5 years, much longer than is generally recorded for immunity acquired naturally*. The findings are reported in an Article Online First and in an upcoming Lancet, written by Professor Robert W Sauerwein, Radboud University Nijmegen Medical Centre, Netherlands, and colleagues.
In a previous study by the same group it was shown that immunity to infection with Plasmodium falciparum can be induced experimentally in volunteers who had never had malaria through immunisation by bites of infected mosquitoes while simultaneously preventing disease with chloroquine prophylaxis. But it was unknown how long such immunity may last; 2.5 years later, the authors have completed this follow-up study.
[Note from SaneVax: In what universe is a mosquito bite concurrent with medical treatment considered a vaccine? Perhaps the term ‘vaccine’ is being used because vaccines carry virtually no risk for potential product liability claims. How long will medical consumers tolerate constantly changing the definition of vaccine in order to protect pharmaceutical companies?]