How infectious is smallpox?

All of the following are individuals who are immunocompromised and are most at risk for developing tuberculosis EXCEPT __________

a. teenagers b. the homeless c. infants d. the elderly

Once the DNA of a virus has been removed using the genetic engineering process, the virus:

A) Is no longer able to inject its DNA into healthy cells. B) Is no longer able to inject its RNA into healthy cells. C) Can only inject its DNA into genetically modified cells. D) Can only inject its RNA into genetically modified cells.