On the following image, label which parts of the virus you think are often referred to as "keys."

There's no image but it will be the one that goes into the other one.'lock and key theory'

Explanation:

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.