In contrast to many of the diseases we currently immunise against, malaria does not confer what is known as sterile immunity. This implies that if you have malaria and recover, you can contract the disease repeatedly. Your immune system's past response to malaria vaccines will not shield you from infection in the future. In contrast to a disease like the measles, which almost always results in lifelong immunity, this condition is not contagious. When it comes to malaria, there is evidence of some naturally acquired immunity; a person who has previously experienced the disease can still contract it, but she will likely experience a less severe case.
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