Malaria is still deadly. AFAIK, there are no shots to prevent malaria. A person can take 100mgs of doxycycline daily to help prevent malaria but it is not a 100% protection.
Malaria is also a very opportunistic illness. When a person’s immune system becomes compromised through another disease, the malaria parasite often seizes its chance and becomes active in the system.
Malaria is common in all tropical/hot countries. I am sure I had it a few times growing up in India. My mother knew exactly what to do. It was plenty of quinine pills. Always recovered without any leftover effects. May be there is one left over effect...I still like carbonated quinine water.