in addition to calcium, what appears to prevent and treat hypertension in certain populations?

The answer is Potassium.
Potassium and  calcium play a critical role in both the prevention and treatment of hypertension. An increased intake of minerals such as potassium, magnesium, and calcium by dietary means has been shown to reduce blood pressure in patients with hypertension. This is because potassium lessens the effects of sodium. 

The answer is overmatching

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.