Researchers from the Michigan State University in the US have found that a strain of bacteria called Wolbachia bacterium can infect mosquitoes and make them resistant to the malaria parasite. The study published in the journal ‘Science’ said the parasite struggled to survive in infected mosquitoes BBC reported. Experts hoped that giving mosquitoes malaria immunity could reduce human cases. The World Health Organization estimates that 220 million people are infected annually and 660000 die due to malaria. The study looked at the Wolbachia bacterium which commonly infects insects. It passes only from females to their offspring. In some insects the bacteria is exceptionally