<Unless I'm missing something ... quick mutation of the virus>
It is a long article but you missed the part at the beginning of the article explaining that malaria is not caused by a virus or bacteria but a parasite.
Also the chart labelled 'Vaccine Discovery' which clearly shows no previously existing vaccines against parasites.
Also, the world map showing where Malaria has not been eradicated clearly indicates that it is found in the tropical belt where unfortunately a lot of poor countries exist.
That's not what that paper says. That paper says that the parasite can itself be infected with certain viruses, and maybe we should look into how those viruses affect hosts infected with malaria.
That paper just reports the discovery of a virus that is a parasite of the plasmodium parasite that causes malaria in humans.
Plasmodium and all its relatives have become parasites a very long time ago, causing a variety of diseases in many animals.
How the Apicomplexa, including the plasmodia, have become parasites has nothing to do with the viruses that may be parasites of these parasites (a.k.a. hyperparasites), which are most likely to diminish the speed of the multiplication of the plasmodia.
It is a long article but you missed the part at the beginning of the article explaining that malaria is not caused by a virus or bacteria but a parasite.
Also the chart labelled 'Vaccine Discovery' which clearly shows no previously existing vaccines against parasites.
Also, the world map showing where Malaria has not been eradicated clearly indicates that it is found in the tropical belt where unfortunately a lot of poor countries exist.